eliminated world

It all started from the first update 1.18, when Minecraft asked to transfer the world to internal memory or something like that, the problem is that my world started to have bugs, so I asked for help.Someone helped me get out of beta and delete the app and the problem is that my world was deleted and it was in experimental mode.I did my best to get my world back and that's where I made 6 very realistic, decorated cities and more. I just want to get the world back, which is in the name of California.