One of the greatest hindrance for a writer to come out of his box is a low self confidence. Perhaps a lot of writers are like this from the beginning. Do you think you lack experience? Then go get some. Try to start on freelancing site. I'm sure an offer would always fits your expertise. Do you think you can't go into a competition with a higher rank writer? Of course you can. First thing, do you think those higher rank started being the best? Of course not. They all came from scratch. But practice and confidence makes them out of their comfort zone and take courage to challenge themselves. So now, look at them. You could do that, as long as you have the will you could make it GO CHALLENGE YOURSELF!