So France going first will allow France to attack Northern Italy which can reduce it to a minor.
The ideal move would be move all French Units to Paris which adds two infantry, two artillery. Then you buy five infantry and an artillery or AA gun to chew up your money and then UK moves all their aircraft to Paris. Doing this will force Germany to move everything against Paris including aircraft. This will delay Germany from going all in against USSR which will allow USSR a lot of freedom on their side against Germany. I’ve been playing bids of $60+ so this should be tested.