I would be a better husband, first of all. I'd have much more time and energy available for more than what I already do around the house plus better dates. Beyond that, I think I'd write and record a bunch of music just to share with the world, maybe try to make a few bucks off of it but not beyond "buy me a beer" type donations from people who can spare it. I really want to do a post-rock concept album before I kick the bucket, just to have a big completed project checked off. Maybe I'd write some bad poetry too until I got sorta good at it, maybe a book if I had enough to say.
I'd also play even more video games, obviously. Maybe I'd finally hit champ in Rocket League lmao.