Daddy Walrus,
My advice would be to try to relax in the bunch, while being observant of what's happening in front of you. Learn to look further ahead than 1 or 2 riders and anticipate what is likely to happen. watch for erratic riders and try to keep away from them. Riding smoothly uses less energy than if you are tense and reacting to every little movement in the bunch. Learn who the more experienced riders are and watch how they position themselves in a race, when they put in an effort and don't be afraid to ask questions. We all continue to learn from mistakes, hopefully, although you have to wonder with some. Last piece of advice, don't put too much pressure on yourself and continue to enjoy it. Hope this helps a bit.