Interesting...
Well the obvious answer is that the Nazis wouldn't fracture into what became the dominant 'New Germany' Party under Goering and Goebbels' fringe 'True Blood' movement if he'd stayed.
Probably would have been an earlier war with the Soviets, given what we know about 'Crazy Uncle Adolf'. He was a great speaker, but little sense of proportion. When Goering became Chancellor in the right-wing coalition government, he was very cautious and into playing the long game with rearmament.
Which worked out...with mixed results of course, didn't it? OT1H, when Germany joined the Joint Declaration of War when the USSR invaded Finland, their army was still fairly small and the Soviets wrecked Berlin before Rommel drove 'em out. OTOH... A more rapid rearmament drive might have meant that Britain and France could have been hostile to Germany, there might have been no Grand Coalition against Communism. And no 'Special Relationship' between the British Empire and the German Republic like we have now.
Heck, the entire war against Communism might have been different. Which would have been bad for your homeland,
@Count Valerian - OTL Japan made massive gains as part of the Grand Coalition...