The right to fail
You have a right to fail. Sound strange? Often, when people fail, they just throw up their hands and stop trying. They blame other people. They quit and then they say, "You weren't inspiring enough; you didn't motivate me." Motivation, though? It's an inside job. You've got to be looking for the inspiration.
Passion and play
Stepping into passion and play, tapping into your creative passion, is enlivening. Unhappiness is a choice (kind of).
The sad place
It seems to me that depression is, at its essence, a feeling of being pressed down, unable to get up, unable to effect change in one's life. The sad place...what does your sadness tell you?