Most of the advice I give to artists boils down to this:
If you don't feel strongly about the project, don't do it.
You've got a limited amount of energy, time and resources to devote to any particular thing. You don't have enough to waste on stuff you're doing "just to do it".
Sure, that may mean that you're doing nothing for a while. But this market is so cluttered that doing without passion is pretty much the same thing as doing nothing.
This market hates your B- stuff. They want A+ and it can take a lot of time and effort to get there.
Devote the time, don't waste it on anything less then your best.