The reasons they lost the war:
1 They did not just take out Britain after the blitz of France, Belgium etc.
Yes I am aware it would still be very difficult for the Nazis to do this.
2 Invade Russia without enough materials, Tanks, Guns, men.
If they had also gotten Japan to invade Siberia.
Waited to gather oil from Romania,
Not halt the Strumgewer program
and just more men.
Have Japan wait to get the united States in the war.
If Japan would have waited they could very well had a better chance of winning the war.
Less Submarines more cruisers. If the Nazis had built more cruisers, battleships.
They could have put more of a strain on the British war effort.
Better anti aircraft guns.
If this was done the Nazi war effort would have been much less effective.