Please fix this bug! My Minecraft world no longer works, it is my favorite world! Once I open the world things work, but then after a minute or so, I can move but, all mobs are frozen, I can't open chests or any other thing that can be opened, I can't die, commands don't work, no breaking Animation, no sound, some spots don't load, MORE!!! Please fix this bug, I can no longer play my favorite world 😞.

I tried various of ways to fix it, including the way posted on Minecraft Wiki, but nothing works. Please help me.

Update: Please listen, it still doesn't work.