Updating a world from 1.18 to 1.20

Alright gather around gather around, for I have a world that uses cave worldgeneration I slammed together for me and some friends to play on. Now whenever I try to update to 1.20 it simply fails to load. Corrupted they say. Output logs state Overworld settings missing.

I am genuinely at my end man. I just want to know how to just remove everything and just keep the world in isolation with no datapacks just everything built and already generated so I can put it with a 1.20 compatable generation datapack and actually load it up. Is that even possible? I don't care if it looks jarring I just want to load this damn thing.

I am so lost I swear to god. Hell i'll straight up pay someone 20 quid if they help me I ain't even capping paypal that shit you know what i'm saying? Please for the love of god just tell me what info you need and help me please
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