Make a list of novels you have enjoyed and re-read them, in French. Then move on, to books you haven't already read. I say books you have read already first because you will find it a lot easier to read a story you know.I read a lot mainly in French & English because those are my native languages but I also read a lot in other languages because what I want to read hasn't yet been translated, eg, and I find it really helps vocab retention/acquisition and learning grammatical structures & spelling pretty much by osmosis. It certainly makes a huge difference when you want to have an interesting rather than simply utilitarian conversation.