Short answer: Can't be done, at least with acceptable losses.
Somewhat longer answer: With the USSR defeated (with the A-A line presumably achieved) and the UK defeated and occupied there is no way to mount a reasonable invasion effort. Even a respectable air campaign is questionable since the Reich will have effectively unlimited oil reserves, access to enormous amounts of raw materials, AND all of the tech the UK was working on, including the RR jet engine design studio and Tube Alloys.
Game over.
And all the tech the USSR was working on too, and millions of forced laborers to manufacture rocket weapons.
While taking Britain by 1941 was impossible in the first place, if it did happen, it's basically halfway (or one third of the way) to a
Man in the High Castle scenario.
Related issues:
1) Does Japan still try to expand into the Pacific and thus provoke the U.S. into the war in the first place?
2) Do Canada, Australia, and New Zealand cut ties with the "mother country" at this point so as to avoid having any of their resources and citizens at the Nazi regime's disposal? If so, what do the Nazis do about it?
3) Are Ireland and Spain able to remain neutral and independent?
1) Japan certainly still attacks the US at Pearl Harbor leading to the Pacific theater. Germany
might still declare war on the US, they're in a better situation than OTL when they declared war.
However, with the Royal Navy defeated, Germany doesn't even need Japan as an ally anymore. The Germans will probably put Edward VIII on the throne in Britain, and attempt to make the dominions into puppet states, including India, Australia, and New Zealand, which Japan wants. Australian fears of the Japanese Empire might play into the Nazis' goals here. There may be a proxy war in India as well.
So the alliance probably ends. But there is a small chance that Germany uses Japan for an (impossible, unfeasible) combined direct assault on the US, especially with Hitler being Hitler. This is of course doomed from the outset.
2) Western Allied resistance certainly continues in the dominions. However, with all the resources of Europe including Britain, it would be vaguely possible for the Germans to force them into their sphere. They would have to act quickly however while the Empire of Japan is still a threat; otherwise, Australia and New Zealand will vastly, vastly prefer the US.
3) Ireland and Spain may remain de jure independent, but they will become client states de facto.