Don’t get carried away at the start. It’s really easy to batter yourself trying not to lose places in the first bit and then spend the next 20 minutes paying for it and have all the people you went past return the favour while you try and get your lungs the right way out again. This is especially true if, like all normal people, you don’t do any sort of warm up other ride from where you parked to the start.
NB: you will probably still do this because it’s a race and people are getting away.
Do thrash yourself trying to catch that person just in front at the end though because no matter where you finish the “I could have made up that one place” after race analysis is a thing.