depending on your car model and worth.
a 10 year old mazda 3 is listed for 15k in market, yet when you trade in it would be 5 to 8 k. Actual successful sale may be 10k.
Went to carsome , they offered 6, went through bidding no takers.
Sell through work shop agreed 10k, after buyer come gave all kinds of reason and let go at 6k.

In the end, do you need the hassle? If car is of significant value, sell yourself.

Last time carsome offered F30 60K, self sell got 80k.