I write the music I want to hear. That's it.
I try to be honest with myself, so that I can appreciate what I've done but point out what could be better and move on from there. It's not about me, it's about music.
Songs I've completed at the very least captured a moment in time, so sometime, I dig one up and re-visit that moment. It has a "historical value" to me, and I try to figure out why and how it works.
When I'm not inspired, I write pastiches and studies, to extend my vocabulary and to be able to raise my own standards if I have to write on command.
When even that doesn't work, I try to learn how to mix better.
When that doesn't work, I pick up my Logic Certification book and study my DAW of choice. Or get familiar with Pro Tools.
If I'm too tired, I put on a movie and practice scales, or try to come up with new warm ups on the guitar. Or I just play the blues.
I can work on a two notes phrase for hours. Or a single string bend.
Or if I really want to change my mind, I go downstairs and clean up the house, listening to Mozart.
I've not found enough time to really work on my voice as much as I want. I also want to learn to play piano better. Drums would also be cool. And mastering.
If I need a real break, I pick up a case of beer, sit in my studio and listen to music...
The only thing I've never questioned in my life is music.