$3,700 sales tax credit on a $30k trade? You must live in a high sales tax state/city.
You're basically looking at $33,700 through Tesla which means you'd want to get at least that selling privately or to a dealer. I'd recommend you next get quotes from Carvana, CarMax, etc. Seeing some of the high Carvana retail asking prices, you may be pleasantly surprised by their purchase offer.