Game ideas for intermediate/advanced developers

What are some good ideas for a game I could make as a intermediate/advanced game developer?
I know some stuff and I’m currently trying to make a project, but I need I need ideas of what game to make, and stuff like that. I’m looking to improve my skill as a dev from this project, and also make some. What kind of game would be easy for me to make with my skill range?

something that you feel like you can do, once you start thinking you can do it, and never stop, you can make alomst anything

maybe you can try a dungeon-esque game like final fantasy