I don't know how long ago I posted this but I posted about a world that won't load. It is my modded world and it is on version 1.16.3. I tried to do everything everyone said, delete the config folder and let it load again, delete the playerdata-folder, and try without optifine, using my backup version. None of it worked and after I just got frustrated and stopped trying but I really want to get back onto that world. Here is the crash report from today Crash Report
If not, remove mods out one by one to find out which one is causing the issue.
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Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!