Just get a refund, no idea why you would bother trying to sell it. Anyone can get a tesla within a few days to a couple weeks tops. So the short answer is, no, no one would be interested in buying a reservation because there is absolutely zero need to reserve a tesla unless its a model Y, and for model Y anyone can reserve it now.
Tesla has proven that reservations dont mean "that much" as far as queueing when cars are actually delivered so. you reserve so you can be one of the first.
Unless... you are somewhere in a country they have not rolled out yet?