No later then early August, at that point a certain piece of equipment get redirected from the Pacific Theater and it's a sunny 10,000 degrees in Central Berlin.
4. Evacuate the Courland Pocket and redeploy those forces against the Soviets. IOTL, hundreds of thousands of German troops were left uselessly isolated in the Courland Peninsula, seemingly just so Hitler could say that he still occupied some bit of Soviet territory. The Russians basically left a single army there to entertain them and otherwise ignored them. Those troops would have been much better used with Army Group Center.
5. Strip Norway of all troops except those strictly necessary to keep down the civilian population. Far too many troops, from the German perspective, were left in Norway to defend against an invasion the Allies had no intention of mounting.
This would effectively give up on the U-boat war.
They used bases in Norway, and IIRC one of the reasons for holding Courland was protecting U-boat training areas in the Baltic.