You missed the boat with Carvana. The prime time to do that was Sept 2021 - June 2022.
Your best bet is to do this-
Have it professionally cleaned/detailed. Get the maintenance up to date. Make sure it's got good tires, brakes, etc. Get it looking and acting as like new as you can.
Write out a GOOD, COMPREHENSIVE description and put it on FB Marketplace. State at the bottom of the description - No scammers, no lookers. Do not send "Is this still available", this will be 100% ignored. If you mistakenly hit send on that pre-recorded message, immediately send a message saying it was a mistake. Send me a well-written message stating that you are seriously interested in the car.
I assure you that stating that last part in the description will bring you interested parties. It will also allow you to legitimately weed out the people you do not want to deal with. I have had 100% success with this method described above for several cars in which match your situation - me selling cars for my stepfather, mother, etc. I have them cleaned, I survey pricing, I write great descriptions and I have the maintenance up. I have had ZERO PROBLEMS getting high-quality, serious buyers to deal with in less than 24 hours.
Do what I say and you will have a few serious buyers on you in a matter of hours and you will get top dollar. Probably 25% more than any car lot will come close to offering you. Like was said above, no car lot other than a buy-here, pay-here is going to want that car. A lot of private individuals will want it.