If the US hadn't been backing everyone with unprecedented material support, followed by direct involvement in the war, Germany would've won and the world would be a much better place today.

Hitler wasn't trying to conquer and absorb all that territory, he was trying to briefly defeat them and find peace. He tried to make peace with Britain like a dozen times.

Waiting for the Soviets to attack would've been absolutely insane. You don't wait for the enemy to attack on their terms, you spoil their attack by striking first. The fact that the Soviets were planning to attack Germany is why they had so much trouble when Germany attacked them first: their disposition of forces was all wrong for defense of their own territory.

There are a lot of parallels between Russia's position now and Germany's position back then, including the fact that Ukraine was planning to attack the eastern oblasts and Russia preempted them. And while Russia is in pretty good shape so far -- contrary to the popular narrative in the west -- it's not out of the question that they'll end up being destroyed just as Germany was. Certainly that's what the western elites want, but it really depends on whether or not the west decides a nuclear war is acceptable.