The best way to get better at game design is to practice game design. I firmly believe every nascent designer should give it a go in the public eye so they can get some feedback on their ideas and though processes. So here's your chance. Right now the Iron Game Chef is going on sponsored by Andy Kitkowski (of Story Games and 1KM1KT fame). This is a contest where random "game ingredients" (which are really just game terms used to inspire design) are passed out to the contest participants. Everyone has two weeks to create a design and post it for general feedback. It's a lot of fun and a great learning opportunity.
If you are reading this, then you need to do it. No, don't blow it off. Go to THIS THREAD right now and sign up! I've done it and as a result I've got The Holmes and Watson Committee RPG coming out this year. Other people have done it and produced games like Polaris, The Mountain Witch, and Crime and Punishment. So this is your opportunity to strike gold. Please, please join in and feel free to use the resources I've posted at Socratic Design to help you gain an edge. Trust me, you won't regret the decision to enter.