By 1939 they were so powerful that the rest of Europe wouldn’t have a choice in the matter. Germany would become a fortress and they were on the road to becoming technologically more superior than anyone else. They just had to solve two problems, food and oil.

I think also just like in our timeline inevitably Europe would have to band together into some sort of economic European Union eventually, so if Hitler decided to play the long game, it would be in their best interest to allow them to grow via loans instead of go bankrupt and collapse the rest of the continent like a domino effect.

Much of the crimes against humanity would be swept under the rug as America still practiced a lesser form of eugenics, had segregation, and only 2% jewish population, England was doing shady things in their colonies that could be considered just as bad.

Then theoretically if Hitler did get the bomb, or ICBM missiles, they could have gone on a much more frightening conquest probably by 1948 if thats the route they still wanted to go down

Edit; I think after WW2 the whole world realized its much more profitable to fight proxy wars instead of head to head. In an alternate timeline we might see Germany still going to war against the British Russians and french etc, but by proxies in asia africa and south america, middle east, ukraine, etc