One of the keys to success is passion. If you care about something or want it naturally you won't need to force yourself to work on it. The passion will be your fuel. Only work on things you are passionate about.
"In the end we only regret the chances we didn't take." So be risky because you would rather look back and say I can't believe I did that instead of I can't believe I didn't do that. I do regret that amazing chance that I didn't take.