Spar a lot. Spar against people better than you to improve faster as Crono said, but don't get carried away and series someone who flaws you constantly as there isn't much to improve upon in that case, step by step. Alternatively, you can guild spar if you're really concerned about your record. Guild spar gives you a nice array of players to spar against and test yourself without affecting your record. It was something I used to do a lot when I was starting out, when US was still active. By sparring people like Praydoh and Ares and Rufus in guild spar when I was starting out in spar, it helped me to improve a great deal.