Its a pretty bad time to sell a used car right now in general, and its going to get much (much much) worse in the next few months, what with all the unemployment, etc.
I would say that TMC (this wesite) is one of the worst places to consider selling a used tesla, because there are people that just hang out in the tesla for sale section and beat up people on how their used tesla is overpriced etc. It depends on why you are really selling. If you dont "have" to sell, you are likely better off waiting almost a year, when we are hopefully on the other side of this "shelter in place " world and the situations have calmed down.
If you have to sell now, other than tesla, carvana, vroom, and autotrader / private ads, its the same as selling any other used car. The autotrader /private ad route always has the issue of you pricing the car for X and someone showing up, wasting your time, and saying "I have X minus 8K here IN CASH right now for your car". Its a hassle to sell private party but you can get the most money for it if you take your time.
The others are much faster but you wont get as much money back.
best to not sell at all, or if you have to sell, try those three above and take the best and move on.