>>18661363A tricky subject, since nazi germany never really had a true shot at victory, and hypotheticals that give them an edge often veer into outright science fiction to justify it. But if we're gonna talk a more realistic approach, lets assume that the nazis were able to hold both fronts and they maintained its maximum size from 1942 before peace talks established new borders.
First and foremost, the genocide finishes and nazi germany finishes cleaning up its camps of POWs, political opponents, genetically inferiors, and jews. After that, germany is going to be in full dictatorship recovery mode, forcing people to work just as much as wartime to help pay for repairs and soldiers. They very likely might go iron curtain as well, due to the shitass conditions the empire was left in from a two front war and a general unwillingness to trade due to grievances and the looming threat of world war 3.
But in general, nazi germany would have been left in a bad spot and an even bloodier probably nuclear war would strike very soon after. There was no lasting peace to be had against people who think you should be dead.