Legitimately invest a shitload into Bitcoin before cashing out at the top of the last bull market we just had (waiting a good number of years until then just having fun being young.) I'd then buy a plot of land in the middle of nowhere, set it up to be completely off-grid (as much as can be done, anyway), and then live happily in peaceful isolation while the world burns itself to the fucking ground and I hopefully die before I hit 60.

Unfortunately I didn't do any of that in 2013, so I'm still working on step one here in 2023... whatever the hell the right move is in 2023.