Join a club. Do the club rides, especially training rides, with upper category racers. Listen and learn from them.

If there is a racing clinic in your area, do it, even if it comes down to a 4 hour round trip drive for a 15 lap race. You will learn a lot, in a very safe environment. Ask questions. I see riders I've mentored every week at the races. I help them with strategy. It's fun to watch it play out.

Finally, I've seen dozens of triathletes enter bike racing do the same thing. They ride off the front in their first race and win, so they do that the following week, and win again. Then they think they know all there is to know. Winning in Cat5 means nothing. Cat5 is for learning, about racing, about yourself, about your strengths and weaknesses. As a triathelete, you know you are strong and have good endurance, so put that to good use in a break. Do a kilo effort in the last laps of a race. Figure out where your sprint stacks up, and then get to work on improving it. Take a flyer at a good feature point on a course and try and start a break. Attack after a break has been caught. Whatever you do, just don't ride off the front solo every time.