Treat this like a hobby, not a job. Treating it like a job is a sure fire way to kill any interest in it, by expecting to make money off it. That stress of needing it to make a game that will sell can lead to burnout.

Maybe you'll make a nice game that will be loved by 2 people. Or 20. Or even 100. Perhaps you'll even make that 1% game that will sell millions.

This shouldn't be your motivation.

Make the game you want to make. Don't try to make what you expect will be popular. Don't try to predict what the next popular genre will be. You would probably have better luck in a casino than predicting the next popular game. Just make the game you want to play.

And then when you're done with that game, take what you learned and put that into the next game.