> But I don't know if I have a book in me. Because every time I try to write things that could possibly turn into a book I read them and they don't sound very good. I know what I'd have to do to change that, namely write a lot every day for a few years until it clicked. But I don't.

Could you expand on what you mean by this?

problem: you write down something, but it doesn't sound very good

solution: write a lot every day for a few years until it clicked

How is the problem solved by the solution you presented?