OTL was a France wank, it almost impossible to make a TTL where France would be better of territorium-vise. They were placed in the middle of the most densely populated area of Europe and succed in two hundred years to push their entire border from north to south 500 km east, without a grand coalition stopping them.
When they finally started a war, which killed in precent more than WWII of Europes population, and was completely beaten, they were rewarded with small expantion of their country.
When their abused easten neighbour finally defeated them, in a war started over a newspaper article by the French, they only took a small slice of territorium.
Short of the French shitting gold bricks and pissing crude oil, I have a hard time to see them better of.