Need more self insert , reincarnation or transmigrated or whatever need more.

I like isekai when a whole new person get in the book and start changing the whole novel it's fun to read. If you have any please do recommend me. Oh and also if you know fanfic where they follow a minor demi god please do tell me I don't mind if it's not a self insert or whatever. I would also boy loves if you know any please recommend me Thank you.