Are we talking like I die once I finish it? In that case I'm making a gigantic open world lifesim with an insanely large scope and remaining a solo dev for the entire project (i will never finish and thus never die)

Or do we mean like i'm dying in a year regardless and have time to pump something out first? In that case probably just a super nice incremental/idle game, that would be a fun legacy to have, nice and relaxing.

Or do we mean last project for a while like i'm going on a multi year business trip or something and won't have time to dev? In that case, I have no idea.