Since three years of participating at writingcontests in Dutch, I have twelve publications of short stories. I won three contests. The strange thing is that winning can get in the way of creativity. I tend to expect more and more of myself, and this is a sure recepy for writer's block. Before I wrote for fun, after I wrote to win. The solution is to start writing for fun again. Not to expect to win everytime, to have the greatest story-ideas every round. Originality and high expectations don't always go together well. I'm reading the Comic Toolbox by John Vorhaus and he seems to agree with me.
I have to find my way to create plots on demand. Here also the Comic Toolbox is helpfull.