Hey Duhabaaa, its nice that you have started on a game, but its hard to answer a question like this without providing at least some direction that you want to go in 😆.
In general I would advise creating a story you are yourself very passionate about, or starting from something you like or dislike. For me it always feels easier to create something I have fun memories of, or something that I feel passionate about.
Hopefully that helps a little bit, good luck with creating your game!! 😁