i paid $2025 for a seasonal campsite, sold my rv and turned in the key to the campground. since i bought a new rv and want back on my site. the owner

Something's missing here with your facts.  What did your contract for the seasonal campsite say?  Do you have to renew it yearly?  If so, did you renew?  I would think that might answer your question.  What's the key to?  I take it the the facts about the rvs has nothing to do with your right to use the campsite, correct?