Rewind my life as many times as possible to correct bad choices. Something like Groundhog Day but I can choose any year of my life and trigger it whenever I decide. The first thing I'd try is return to January 2009 to mine and purchase as many Bitcoins as possible, then avoid some mistakes I did with my ex-gf.
Even if she dumped me again, it's OK, I'd know the Bitcoins would make me a multi-millionaire and I'd become a Sugardaddy for cute college chicks.
If I fuck up anything else I'd use the power again etc.