Presumably shored up power on the continent while trying to further isolate Britain and Russia diplomatically. But that's not the kind of person that Napoleon was, nor would the rest of Europe just taken things lying down. There is no plausible situation in which Sea Lion could possibly have succeeded. The Germans had no ability to get their forces across the English channel, and the plans they did have were laughably poor. Contrast the slapdash preparations that would have been in place, to the attack that we know succeeded, Operation Overlord. Overlord took place after years of planning by the Allies, with massive industrial resources provided by the United States, enjoying air and naval superiority, along with a hefty element of surprise and support from airborne troops. While it was doubtful that the Germans could have successfully pushed them back with all those advantages, it was also very difficult for the Allied troops to breakout from their beachheads. Napoleon's invasion of Russia was probably a bad idea, but it was by no means a foregone conclusion that the invasion would fail. It was also not simply the Russian winter that did him in, but effective resistance from Russian forces, that at least forced Napoleon to retreat back along the same ground he had advanced through, denying them supplies during their withdrawal. And while the Soviet Union would eventually play the largest hand in defeating Hitler, it's not exactly clear what other options are available to Germany in 1941. England is essentially unassailable, while the Germans are increasingly paranoid about growing Russian strengths. North Africa would be the likely place effort would be diverted to, but the limiting factor there for both sides was logistical capacity rather than volume of troops. And Germany can't afford to sit on her hands, as the Nazi economy was essentially a shambles.