Sounds like a difficult state to be in, perhaps you can consider one of the online programs offered by US universities like OMSCS by Georgia tech, or OMSC by UT austin, there are several others like that. They offer same curriculum as the in-house program but with online delivery and are flexible for working professionals

Well, I'm 41, and have about the same amount of experience, so you're not alone. In the USA, the main barrier for education is whether you can afford it, or don't mind being strapped with massive debt.

It's not a great time for us, but freelancing has been a lifesaver. Have you tried getting on a freelancing platform? It's probably easier to get work as a C++ developer than have to compete with the thousands of Wordpress devs.

Is that actually true that you cannot to university after 25 in France? You could do Open University from the UK online; I think it is quite a credible program. It's open to almost anyone in the world as far as I know. If you are diligent, you can probably finish in 3 years even with a full-time job, but this depends on the person.

https://www.open.ac.uk/courses/computing-it/degrees