An economically self-sufficient German Reich didn't. The US had the resources of the Western Hemisphere to draw on: rubber, tin, copper, etc.
There is much to be said for "reshoring" industries and bringing back American manufacturing, but you are acting like a troll.
Germany’s problem was oil. Simply couldn’t get enough. They were trying to make synthetic oil but it never got off the ground.
PS The third Reich used factories from all over central and western Europe.