Time Traveler

What would you do if your time on earth is limited but a way too long? And seriously what would you do if you have a power but not some kind of powers from fairy tales that you used to know, it's like when you want to back from your past, you can easily go back without chanting weird prayers but there's one thing. There's a big consequence that even the mighty author of this story doesn't know anything about it. Can you handle it?