Agree very much that fear of failure is an artist's worst enemy. Very much disagree that big-bucks selling prices are a sign of artistic prostitution - I have personally starved in a garret, and it sucks!
Stating you are bored with photography is rather pointless attitudinizing - if you are bored, do something new. If you can't think of something new to do, try a radically different approach - if you normally work very slowly and meticulously with LF, work fast and without thinking with 35 mm. If that doesn't work, stop for a while. And if that doesn't work, stop indefinitely until you feel an irresistible urge to start again!