If you would like to sell your car for crypto in the Monaco, Spain and France area, you'll need to find a crypto-accepting car dealership. You can search online to find a dealership in the area that accepts crypto.
You may also want to look for peer-to-peer marketplaces, where you can post an ad to sell the vehicle and may be able to find a buyer who is willing to pay with crypto. Once you find a buyer, you can agree on a price and method of payment (e.g. which type of cryptocurrency, digital wallet, etc). Then you can complete the transaction, and the buyer can take possession of the car.