hmmm... As high level of regen I can get away with in the rules of the game and.... I read a few Whateley stories years ago, there was a power where you just become an idealized version of yourself, body and mind, I think Examplar? Anyway that, to the level where I'm in the top 0.1% of humanity on every affected variable.
As for the universe... The Expanse a few years before the first book or 2 years before Persepolis Rising. Spend a year enjoying the cool tech and visiting space.
As for when I get back I just get on with my life but I'm harder, better, faster, stronger, smarter, etc... as well as long lived and able to survive a lot of crap I'm not able to right now. At that point I'd probably be able to make some easy money, take a year or so off to travel the world and get used to the new me, and then who knows?