Germany had the technology and the military know how to conquer and hold Europe if they hadn’t been ruled by a genocidal madman. His destruction of his armies on the Russian front gave the West a chance to defeat him. Of course a leader other than Hitler likely wouldn’t have embroiled the world in a huge war a mere twenty years after the previous one.
I think a better strategy for Hitler would have been to maintain his alliance with Stalin, at least in the short term.
The forces used in Barbarossa could obviously have pretty easily conquered North Africa and swept all the way to the Persian Gulf. Stalin gets Romania, Bulgaria, Persia and Turkey. The Med becomes a German lake. Hitler’s fuel problems are over.
Spend perhaps five years using his newly acquired resources and the industrial power of all of Europe to build up an army and possibly even a navy that would allow him to quickly crush Stalin when he finally attacks and then turn on the West. World domination.