Set a timer while you write to go off every 3 minutes. Each time it sounds, strike out the sentence you just wrote and write a completely different sentence.
Take a page of your writing. Strike out your 3rd, 8th, and final sentences.
Read the newly-revised version.
Now strike those sentences out again. Rewrite them. Don’t revise them–change them completely. Go in a totally new direction.
Feeling done? Great. Strike them out one more time. I know, I know. Now go with it–write a new version. See where it takes you…