Sometimes when I talk about Game Dev (Financial) Success I get comments like: "what if I don't care if my game is successful? What if I just want to make something for myself? Do I still need to follow all this marketing and genre advice?"
If you're making games just for fun then there are no rules! Make whatever you want and spend whatever time and resources you want.
If it's just for fun then as long as you're having fun and enjoying the journey you're doing great! Keep going!
Personally I do fitness for fun, I go to the gym every day, I run, I lift, I've been doing it for almost 10 years, I've spent thousands of dollars on gym memberships, equipment, supplements, etc. And in all that time I've made $0 from it which is fine since money is not my goal! I'm enjoying the journey and have no intention whatsoever of turning that hobby into a job.
If that's game dev for you, if it's a hobby for fun, then yup do whatever you want! If you want to spend 5 years making a 2D Puzzle Platformer then go for it! There are no rules if you're making something for fun.
But if your goal is to make games for a living then it really pays to listen to advice so you increase your odds of finding success.