@Corperal-Siggy-F option 1: stand outside of Moscow while slowly building up ground trips. Germany should be able to gain 10 ground units a turn plus a couple planes. Russia can’t keep up and eventually gets overwhelmed. That happens on G7 without Allied assistance, and inevitably around G13 even with the best aide.
Option 2: head down to the oil fields and boost the German economy. Threaten Egypt and India, forcing more defensive spend by the UK powers.
Option 3: launch a surprise sealion attack around turn G10 if the Allies have been too focused on defending the Eastern front and haven’t invested enough in the Atlantic.
The Germans should getting 70 PUs a turn around G6, meaning that they out-earn Russia plus UK combined. If the United States focuses on Europe instead of the Pacific, Berlin can be forced to play more defensively so pivot to a game plan where Japan achieves victory.
You should be able to win 90% of the time with the Axis but sticking to these fundamentals.