Do you and your family speak English? Do you have a teaching qualification? Do you live in France?
If the answer to all of those questions is yes, then consider teaching English to young people through a homestay English course during the school holidays.
Daily English is a company that arranges English immersion holidays for French children, where host families will take in a child (or two) for a week at a time to immerse them in the English Language.
Every morning of the holiday, the child will have a short English lesson with their teacher. The rest of the day is free for the whole family to enjoy English-language activities together (the cinema, the beach, horse riding) and cement the child’s learning through play.