You will and should do everything in your power to improve your actual writing skills. You’ll work hard to create characters that are compelling and unforgettable. But in the end, it’s the story that matters. Don’t ever let the other stuff get in the way of your inherent skills as a kick-butt storyteller. Move the reader, make them happy and sad and excited and scared. Make them stare into space after they’ve put the book down, thinking about the tale that’s become a part of them. Be unpredictable, be real, be interesting. Tell a good story.