My Advice For Game Designers

Never do these 2 things if you want to have fun

Don't try to tie your games to a single shared universe and don't go back to your older projects to update them unless absolutely necessary.
The former is bad because you will end up having to somehow adapt your older works into the setting, wasting time on shit nobody cares about, not even you, realistically, because it's not fun. From that point onwards you will always be stuck having to consider the lore of the universe when making a game. Fuck that.
The latter sucks because it will absolutely drain you. Just work on new stuff or else you will become obsessed and die.