There are only a very limited number of ways for Germany to win something recognisable as WW2.
1. Britain might have made peace in Summer 1940 after the fall of France assuming some POD or PODs such as Churchill killed when HMS Nelson was torpedoed in 1939
https://www.alternatehistory.com/discussion/showthread.php?p=3868204#post3868204 and the BEF captured. The best guess is that Britain would have fought on under any leadership but this is a fairly frequently used idea.
2. I once tried
a successful Sealion timeline but these are unpopular!
3. A POD leading to a strongly isolationist American President such as, for example, Taft being elected in 1940, would leave Britain with great difficulties in continuing the war. We could go all the way back to “The Man in the High Castle” for examples.
All of the above could leave Germany free to attack the USSR in 1941 with a fair chance of success. There remain two less respectable possibilities:
4. Germany continues the war against Britain, for example,
in the Mediterranean while trying to avoid war with either the USA or the USSR. The hope is that the British lose hope and make peace before either of the USA or the USSR enters the war against Germany. This could have got off to a good start in the 1939-40 period if the Anglo-French had been daft enough to bomb Baku (they considered it). This was Ribbentrop's preferred strategy.
5. Germany attacks the USSR in 1941 and wins. This needs Hitler and perhaps Germany to be rather different from their OTL character. I tried to suggest possible strategies
here. However, even if the USSR is defeated, an Anglo-American alliance will still win if they decide to fight. Hitler's hope is that fighting will look much more costly than OTL.
There all done just by recycling my own posts
! Perhaps we need a FAQ!