Megor

Probably, you can contact a real estate broker where you can get some assistance in selling. As I know, you just advertise your house for sale on their platform. Some experts work on different types of property in France https://tranio.com/france/. Many companies work without any additional price for the customers: if you buy your property through them, the price for you would be exactly the same as the one made if you contacted their foreign partner directly. I think it's worth a try.

Have a look at French Property News platform:)

Depends on a region where you're going to live.