Imagining an alternative history. Let us suppose the following.
- Instead of invading Russia after Dunkirk, Germany takes a year or two to consolidate its gains in continental Europe, while doing just enough to keep Britain on the ropes.
- Across the world, Japan avoids antagonizing the USA and does not bother hoarding outlying islands which are difficult to supply and defend. Instead of attacking Pearl Harbor and spreading all over the Pacific, Japan focuses on building its positions in nearby China and Korea, with concentrated air and sea power basically turning the Sea of Japan into the Emperor's private pond.
- At some coordinated time in early 1942 or so, the Axis hit Russia from both ends.
That should be good enough for a starting point. And...GO!
Be careful what you wish for. I might let you have it.