Save current life, go do stuff simmilar to GTA and right before I die, load up the save file to fully reset what I did, repeat.
I'm pretty sure that when you die the save would be loaded automatically, because that makes sense
honestly, I'd probably just do something like mess around with it a bunch, just do whatever I want for a while, get it out of my system
then save when I'm like 20 or so. and live out the rest of my life normally. then once I die, or for any other reason decide to load the save, I can just start back there, and try something completely different with my life
I think that would be nice. and assuming I learned to be very patient, I could spend a lot of time seeing all the ways little things influence the future
it would be even better if you could have more than one save, any number of extras would improve it a lot