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To be fair, if Germany would have won, the jews might not have had to be exterminated. After years of trying to reform them he either succeeded (which we know is impossible) or they'd realize the futility of that attempt. Either way, the jews would have remained contained and isolated from the levers of power, and over time Germany would have gained a voice on the world stage to the detriment of the jews.

I am not sure if Hitler actually did mistakes - he navigated himself pretty well given the circumstances. The wars were inevitable, they tried to force Germany to declare war against Poland (and thus Britain and France) in 1938. The assault from the Soviet Union was predicted to occur in 3 weeks, which forced Germany to either have them come to you, well prepared, with much better odds, or surprise attack them for maximum efficiency (which was the case).

Germany however had large amounts of Sarin, and at least could have threatened to use it against either side to keep it from attacking, so that Germany could focus either on the East or the West. I think that's the key. If I'd be able to go back in time, that's where I'd have changed the course of strategic actions. Including threatening Britain to bomb the shit out of them with Sarin bombs unless they agree to a ceasefire. And warning Hitler of Pearl Harbor and the alliance with Japan, so that the US would have a harder time entering the war against Germany. I'd also lose some words about the nuclear missiles - if there was a valid target to attack, instead of Pearl Harbor, that would be it.

And given that I can speak German, English and Hungarian, and have the capabilities to convince the German leadership to let me talk to relevant persons (including Hitler), I could change the course of history. The very history as we know it would change significantly. I would make sure that we win.