So Nazi Germany can't even survive WWII even if they persue a mediterranean strategy, don't contemplate Sealion, postpone Opperation Barbarossa, get Japan and Spain on their side early, avoid conflict with the U.S. and kill off Hitler?
That's it then. That's the best I've got. I tried.
On this board, a Med strategy is not considered a plus. Here we're more in the "no Africa Corps and take Leningrad off the march" camp. I used to think the Med was a good move, but studying the problem persuaded me that it was only a good idea in computer games.
Postponing Barbarossa also isn't necessarily a plus. Germany's strength was growing... but so was that of the USSR. Arguably the Red Army was at a low point compared to the Wehrmacht in mid-1941; the Germans were on a winning streak and had just gotten a bunch of new equipment, while the Soviets had recently been humiliated by Finland and
hadn't gotten most of their planned new equipment yet.
I'd say Germany's best path is to: Halt all surface unit construction more than a month or two from completion when hostilities commence in 1939. Let Mussolini beat his head against whatever brick walls he feels like but offer him no support outside of Europe. Close the pocket at Dunkirk, and no Battle of Britain. The OTL forces of the "Africa Corps" go to the northern thrust into Russia in order to take Leningrad, link up with the Finns, turn the Baltic into a Nazi lake (move supplies by sea to Leningrad, avoiding partisans and rail-gauge changes), and clear the left flank. If Moscow can be taken before the snow fine, if not dig in and take it next year. The troops brought winter clothing, right? Don't declare war on the US. In 1942 take Moscow, Stalingrad, and offer the Soviets a peace treaty along a line from Archangel to Astrakhan. If they won't accept it, dig in along that line anyway while securing the area behind it. The Axis has a year or two before the Allies (the US will get in at some point) are strong enough to try a counter-blow, which might be enough time to digest their conquests enough to make them into a net economic plus.
Odds of pulling this off: pretty low. Odds of Hitler being foresighted enough to do all this: nil.