Stay hydrated and eat something during the race. My bonking was usually related to lack of liquids and nourishment. I would be riding along feeling good chasing breaks for my teammates then like a light switch I would bonk. I would get to wrapped up in other things and forget.
Stay at the front especially in novice races. The pack will be riding along at a slow pace on the flats and Bam, a big pile up. Some people aren't used to riding in a pack, Hit there front wheel on a back wheel and a dozen people have road rash. The ideal place is at the front of the peleton but still behind someone to break wind.
If you are still getting dropped train more (you may have to quit your job) and hire a coach.
