if you have an area where you are great at (better than anyone you know or heard of), put most of your efforts there, regardless of the expected payout or other considerations. Don't wait too long, unused abilities deteriorate with age (yes, speaking from personal experience).
Shouldn't this depend on the area? What if I think I might be the best in the world at a particular video game?
P/S/A: There are single sentences which can create life-changing amounts of difference.