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. –Isaac Asimov
This reminds of a Nassim Taleb idea on book reading: always be reading many, many books. If you get bored with one, just move to the other, and keep rotating.