Writers are not born prolific. They work at it. More than most of us. That’s how you end up like Isaac “I lost track of how many books I wrote” Asimov.
He got blocked, like the rest of us. But in that moment, he didn’t just sit there grinding his teeth. The asymmetric approach seemed to work for him:
I don’t stare at blank sheets of paper. I don’t spend days and nights cudgeling a head that is empty of ideas. Instead, I simply leave the novel and go on to any of the dozen other projects that are on tap. I write an editorial, or an essay, or a short story, or work on one of my nonfiction books. By the time I’ve grown tired of these things, my mind has been able to do its proper work and fill up again. I return to my novel and find myself able to write easily once more…
Just make sure you always have a spare project or five on tap.