Write a lot. And finish what you write. Don't join writer's clubs and go sit around having coffee reading pieces of your manuscript to people. Write it. Finish it. I set those rules up years ago, and nothing's changed.
You see, I used to do a certain amount of market research by going to the local drugstore and seeing what the truck drivers would put up. Now it's all just copies from the latest best-seller list and damn little of anything else.