Experiment with tactics. Try sitting on wheels the whole race then sprinting for the finish. Try an early breakaway. Try a late breakaway. Try attacking immediately after a prime. Try attacking on a climb. Try attacking immediately after a climb. Try making friends before the race and at the start line and organize a breakaway with a couple other guys. Critique each race afterwards and think of other things you could have, or should have done differently, then try them next time. Cat-5 is for learning. Don't pass up the opportunity. No need to rush the upgrade either.