Sour Grapes philosophy may be more on the bitter side, but we also enjoy seeing articles and poems with a sweeter ending. Simply put, take a negative situation and turn it into a positive one. Just go with whatever inspires you to write or create. Dare to be different. It's the only way we can learn and grow and maybe even prosper.
Motivation is more difficult to maintain.
I would suggest finding what interests you, or ignites your passion. Go with that and you can't go wrong.