You have plenty of errors in this log that you can attempt fixing to resolve your issue. You can see in the log you sent that you are missing textures,models, some of your font images are configured incorrectly, (acscent higher than height)
Here are a few wiki pages, and I highlighted a few of the errors, they aren't hard to find in there so, you can definitely find & fix them.
Now if you need any help along the way of fixing these errors, I can try my best to help, let me know! GL!
https://itemsadder.devs.beer/faq/identify-why-textures-are-not-shown
https://itemsadder.devs.beer/faq/characters#example-of-misconfigured-png
[09:21:42] [Worker-Main-11/WARN]: Unable to load font 'minecraft:default' in fonts.json in resourcepack: 'server' com.google.gson.JsonParseException: Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9 at net.minecraft.class_156.method_47526(class_156.java:983) ~[client-intermediary.jar:?] at net.minecraft.class_378.method_51619(class_378.java:269) ~[client-intermediary.jar:?] at net.minecraft.class_378.method_51623(class_378.java:158) ~[client-intermediary.jar:?] at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]
[09:21:42] [Worker-Main-8/ERROR]: Failed to load model elitecreatures:models/dungeon_decoration_v2/water_pipe_curved_small.json com.google.gson.JsonParseException: Invalid rotation -90.0 found, only -45/-22.5/0/22.5/45 allowed at net.minecraft.class_785$class_786.method_3403(class_785.java:104) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.method_3410(class_785.java:93) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.method_3406(class_785.java:75) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.deserialize(class_785.java:67) ~[client-intermediary.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1290) ~[gson-2.10.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:179) ~[gson-2.10.jar:?] at net.minecraft.class_793$class_795.method_3449(class_793.java:383) ~[client-intermediary.jar:?] at net.minecraft.class_793$class_795.method_3451(class_793.java:305) ~[client-intermediary.jar:?] at net.minecraft.class_793$class_795.deserialize(class_793.java:300) ~[client-intermediary.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar:?] at net.minecraft.class_3518.method_47993(class_3518.java:524) ~[client-intermediary.jar:?] at net.minecraft.class_3518.method_15267(class_3518.java:531) ~[client-intermediary.jar:?] at net.minecraft.class_3518.method_15276(class_3518.java:581) ~[client-intermediary.jar:?] at net.minecraft.class_793.method_3437(class_793.java:86) ~[client-intermediary.jar:?] at net.minecraft.class_1092.method_45898(class_1092.java:105) ~[client-intermediary.jar:?] at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] [09:21:42] [Worker-Main-10/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 1: 1 [09:21:42] [Worker-Main-10/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 2: 2 [09:21:42] [Worker-Main-10/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 3: 1 [09:21:42] [Worker-Main-8/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 1: 1 [09:21:42] [Worker-Main-8/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 2: 2 [09:21:42] [Worker-Main-8/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 3: 1 [09:21:42] [Worker-Main-3/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 1: 1 [09:21:42] [Worker-Main-3/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 2: 2 [09:21:42] [Worker-Main-3/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 3: 1 [09:21:42] [Worker-Main-7/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 1: 1 [09:21:42] [Worker-Main-7/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 2: 2 [09:21:42] [Worker-Main-7/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 3: 1 [09:21:42] [Worker-Main-14/WARN]: Texture lzfurniture:furniture/outdoor/outdoor_pool_water with size 24x24 limits mip level from 4 to 3 [09:21:42] [Worker-Main-14/WARN]: minecraft:textures/atlas/blocks.png: dropping miplevel from 4 to 3, because of minimum power of two: 8 [09:21:43] [Render thread/INFO]: [System] [CHAT] [09:21:43] [Worker-Main-15/WARN]: Missing textures in model minecraft:paper#inventory: minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_arrow_chest minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_back_orange minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_cancel minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_left_blue minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_next_orange minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_right_blue minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_search [09:21:44] [Render thread/WARN]: Missing sound for event: minecraft:item.goat_horn.play [09:21:44] [Render thread/WARN]: Missing sound for event: minecraft:entity.goat.screaming.horn_break [09:21:44] [Render thread/INFO]: OpenAL initialized on device OpenAL Soft on SteelSeries Sonar - Gaming (SteelSeries Sonar Virtual Audio Device)
[09:26:00] [Worker-Main-2/WARN]: Unable to load font 'minecraft:default' in fonts.json in resourcepack: 'server' com.google.gson.JsonParseException: Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9; Ascent 47 higher than height 9 at net.minecraft.class_156.method_47526(class_156.java:983) ~[client-intermediary.jar:?] at net.minecraft.class_378.method_51619(class_378.java:269) ~[client-intermediary.jar:?] at net.minecraft.class_378.method_51623(class_378.java:158) ~[client-intermediary.jar:?] at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] [09:26:01] [Worker-Main-4/ERROR]: Failed to load model elitecreatures:models/dungeon_decoration_v2/water_pipe_curved_small.json com.google.gson.JsonParseException: Invalid rotation -90.0 found, only -45/-22.5/0/22.5/45 allowed at net.minecraft.class_785$class_786.method_3403(class_785.java:104) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.method_3410(class_785.java:93) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.method_3406(class_785.java:75) ~[client-intermediary.jar:?] at net.minecraft.class_785$class_786.deserialize(class_785.java:67) ~[client-intermediary.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar:?] at com.google.gson.Gson.fromJson(Gson.java:1290) ~[gson-2.10.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:179) ~[gson-2.10.jar:?] at net.minecraft.class_793$class_795.method_3449(class_793.java:383) ~[client-intermediary.jar:?] at net.minecraft.class_793$class_795.method_3451(class_793.java:305) ~[client-intermediary.jar:?] at net.minecraft.class_793$class_795.deserialize(class_793.java:300) ~[client-intermediary.jar:?] at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar:?] at net.minecraft.class_3518.method_47993(class_3518.java:524) ~[client-intermediary.jar:?] at net.minecraft.class_3518.method_15267(class_3518.java:531) ~[client-intermediary.jar:?] at net.minecraft.class_3518.method_15276(class_3518.java:581) ~[client-intermediary.jar:?] at net.minecraft.class_793.method_3437(class_793.java:86) ~[client-intermediary.jar:?] at net.minecraft.class_1092.method_45898(class_1092.java:105) ~[client-intermediary.jar:?] at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] [09:26:01] [Worker-Main-2/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 1: 1 [09:26:01] [Worker-Main-2/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 2: 2 [09:26:01] [Worker-Main-2/WARN]: Invalid frame index on sprite wavecraft:item/shugo/leggings frame 3: 1 [09:26:01] [Worker-Main-4/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 1: 1 [09:26:01] [Worker-Main-4/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 2: 2 [09:26:01] [Worker-Main-4/WARN]: Invalid frame index on sprite wavecraft:item/shugo/chestplate frame 3: 1 [09:26:01] [Worker-Main-11/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 1: 1 [09:26:01] [Worker-Main-11/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 2: 2 [09:26:01] [Worker-Main-11/WARN]: Invalid frame index on sprite wavecraft:item/shugo/helmet frame 3: 1 [09:26:01] [Worker-Main-21/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 1: 1 [09:26:01] [Worker-Main-21/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 2: 2 [09:26:01] [Worker-Main-21/WARN]: Invalid frame index on sprite wavecraft:item/shugo/boots frame 3: 1 [09:26:01] [Worker-Main-15/WARN]: Texture lzfurniture:furniture/outdoor/outdoor_pool_water with size 24x24 limits mip level from 4 to 3 [09:26:01] [Worker-Main-15/WARN]: minecraft:textures/atlas/blocks.png: dropping miplevel from 4 to 3, because of minimum power of two: 8 [09:26:01] [Worker-Main-2/WARN]: Missing textures in model minecraft:paper#inventory: minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_arrow_chest minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_back_orange minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_cancel minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_left_blue minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_next_orange minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_right_blue minecraft:textures/atlas/blocks.png:_iainternal:icons/icon_search
