Lots of stuff has been mentioned already, but if you are looking for some kind of secret sauce, it doesn't exist unless it's illegal. Do you have a coach? Do you have a training plan? If you don't have either, you should get one or the other. If you can't, then race as much as you can and don't forget to rest.
BTW I get to race against Mark Tuesday night. We used to be on a team together back in the 80's.