If you don't allow yourself the possibility of writing something very, very bad, it would be hard to write something very good.
One of my decluttering tasks last week involved throwing out/shredding some of my old writing notebooks. Some writers like to keep their "young" writing to see how much they have improved. Not me. When I look back on my writing in my twenties it's refreshing to see how much I have learned, but I don't want the possibility of anyone else reading it. Before I shredded it I did go through it carefully for the possibility of some good words, phrases, sentences I might resurrect in my new writing. Today give yourself permission to write something very bad, break all the rules, make it as horrible as you can. And then save it for this contest next year. Now get back to work! There's a market for every kind of writing even bad writing.
The Writing Nag