If you're looking to sell your car you have 3 options:
1. Take it to a dealership and see what they'll offer you
... hint; it's not going to be anywhere near what you want for your vehicle...
2. You can list it on Facebook Marketplace or eBay and you might get what you're after...
... although you'll need to be prepared to wait to get the figure you want, and probably deal with a fair few tyre kickers who are looking for a bargain and hope you'll be stupid enough to take the bait...
3. You can take your car to a place like WeBuyAnyCar and hope that they'll give you the figure they promised...
... they wont. Ever. The price will start falling the second you've parked on the lot and it'll be a race to the bottom until you're so desperate for the best price that you'll take any offer they make.