Going to the country of your target language

You will (or should) definitely improve though. I was only there for 5 months and my French got noticably better.

And what did you do while you were there? From what the OP says, it seems they wont have any contact with actual French people at all, they expect to magically absorb the language from thin air.

I struggle to believe that you could live in a country without having any sort of spoken communication with the people that live there

Personally I was studying at a French university.

Erm...if you went there alone and lived alone? I know that if I didn't have a job here, I wouldnt have got beyond "Bonjour" and "Pardon, desolée" ever. It's not exactly easy to make friends with foreign people when the most you do is bump into them on the bus, and your original level of French isn't that great anyway. If you pitched up in a strange town in England where you knew no one, you'd struggle to meet people if you didn't have a job or uni course.

Yeah but how would you organise somewhere to live without speaking French? And even if you were speaking English when working at a school, surely you would speak French to your colleagues.

At the end of the day, if you want to improve your language you have to make an effort. Yeah, if literally all you ever say is "bonjour" and "pardon" then your French won't improve, but even the most basic interactions, such as asking for some bread in a bakery or buying a train ticket, will help improve your speaking skills.

The OP seemed to be referring to teaching English as a private tutor, since they didn't mention any colleagues or firm plans, so no French spoken there, or colleagues to speak it with. If I'm incorrect, then I apologise, but the feelings I got from the OP's post was that they hadn't really considered any of this at all, much less planned to rent accomoation etc.

The things you have mentioned won't improve your speaking skills to any decent level at all, that's ridiculous. Any GCSE student can order a loaf of bread, that doesn't make them fluent. Fluency requires constant, complex speaking of the language and a lot of it. You need to have real conversations with French people, not parrot phrasesbook style "Je voudrais un pain au chocolat, svp".

OP, I would really recommend a tutor. I doubt you would be able to find a formal job in France with such a low level of flrench (mine was arranged for me and its unpaid, yet I never would have gotten it by myself), and you need the constant practise to improve at all. Otherwise you will get very good at ordering food, and nothing else.