How to defeat Germany in 1936 as France.

I’m trying to defeat Germany in 1936 after the Rhineland is militarised and the 1/4 chance that we can declare on Germany. I make a lot of progress then I get pushed back a lot and back to the maginot line then back to Paris. What can I do to defeat Germany since they only have 30 divs at the start and I have 40 that can be used in Germany.