The Block

Thing is, there’s no single cure for the Block (this is what serious writers call it; cf. the Clap, the Syph, the Herp).
And the reason there’s no single cure is that there’s no single type of Block. The Block can be daylong, or weeklong; it can last for years (Truman Capote) or decades (Ralph Ellison, Henry Roth). I can’t think of any other writers just now.
Hold on—let me top myself off.
You might take comfort from the fact that while writing can’t be forced, time spent not writing can be put to good use. Try acquiring other skills, like rolling cigarettes or reading. Learn to differentiate between scotch and bourbon. Learn the differences among corn whiskey, rye whiskey, and wheat whiskey. Learn what, if anything, separates whisky from whiskey.