A lot of people worldbuild when they daydream and have the bones of a story kicking around in their brain, but have to pay the bills and raise the kids etc so they never flesh it out and write it down. What’s your story’s premise? Fantasy, sci-fi, alternate history, mystery, western, whatever genre.
That’s the hard part. If I had that, I’d be writing.
If you give me a genre, I’ll give you a premise
Just TRY these. At least check them out. Also use character ai for the characters dialog
https://hf.co/chat/assistant/65e722db59ac89b2b6cd0b5b
https://play.google.com/store/apps/details?id=app.cordes.pluot