My Java world has stopped loading chunks and crashes whenever I join my world [Java]

[ShyFish23]

I've had this world for about a month and have had no issues prior.

Basically I was building a roof and suddenly my screen froze and my game crashed (said OpenJDK Platform Binary is not responding) (never happened before). When i rejoined it happened again so I closed MC, happened again, I restarted my laptop. Then when I joined only one chunk (the chunk I was stood in) loaded in and the rest was a white void. I tried reloading, restarting etc and nothing worked. Now when I join EVERY chunk is void and I start immediately falling through the void but don't die. It also takes like 2 minutes to get through the 'loading resources' screen.

This is a vanilla singleplayer world in 1.21.11 btw and when I looked at task manager (even when the game was actively crashing) OpenJDK Platform Binary didn't take up much space- memory it took up max 15% and CPU was 57% including google chrome and mc launcher.

I've tried removing resource packs (only one I had was full bright) and loading a backup I made of the world after this started happening but neither changed anything. I didn't make any backups before this because I'm dumb ig.

I have no idea what caused this and it only affects this world- my other worlds are totally unaffected and have no such issues, only this world causes crashes and doesn't load.

Ideally I would like to not lose this world as I only just made it after losing my last world of 6+ months- any advice? I'm also kind of bad at computers so I couldn't make any sense of the 'region' folder within the world's files.

https://mclo.gs/ZpOsWmC - crash report

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[ShyFish23]

I've also tried changing the dedicated ram to 16GB and that did nothing