Ah i was coming here to warn you about that.
Ill brace for downvotes but if i can light a candle for just one person, that would be fantastic.
A big misconception about the economy of games is that they are content - economically-wise. An example of content is music or movies, think spotify or netflix.
This is absolutely not the case. Economically, games work like software: a handful of games are played for years and represents 98% of the playtime / money.
Treat games like a startup: what will make your game still be played 10 years from now?
Dont think "im gonna do one game and then another". Think "ill make one game". You wouldnt think "ill make a startup and then another and then another" even though you could its not really how youd think about this stuff right. Do the same with games.
One game. One startup. One product. Played for years on end. Diverge from that strategy and chances are you wont have a good life as a game developer like millions before you.
That being said, lets say you want to make a "content game", that is, a clone (your 2d platformer with a nice plot and rpg elements). Nothing wrong with that but just understand that on the long run it wont be sustainable economically, even if you take a lucky jump.