I would pull it back to Germany and put it in port. . .put enough airpower in Norway to blast away any British efforts to have a fleet near it in order to keep it in supply.
I think it more likely John will attempt to pull his guys out of Norway rather than send good money after bad. . .if he leaves any ships near Norway, sink them with airpower and preserve your fleet. . .
Bomb the hell out of England. . .you also have a whole corps of paratroopers to invade the UK if you feel like it. . . if the opportunity presents itself. . .
Make hay in the Med since the Brit fleet is gone - Get Athens, Crete, and whatever else looks good - like Malta and Cyprus - the more the merrier and the more likely you will pull Turkey in on your side. . .
Stack up for the big Russia push in 41!