I think that there is some online forum were you can improve yourself.
The best would be to find someone who wants to learn your mother language and to do discussions with him or her. (One hour in french, one hour in your mother language). If your are in a university, it should be easy to find it. Else, say your mother language(s) here and maybe will someone know someone else interrested in that. Else some online forum should offer it. You can also try to force you to think constantly in french.
For the writing, it is quite more difficult. A good idea would be to force you to write something for yourelf. Some nice stories or a private diary. But, to be honest, if you’re good at reading and that you try to pay attention to the reason why it is written so, and that you improve your speaking skills, it should be enough.