I read that the goal was to split the British and American forces. Also, if successful it might have put Germany in a good bargaining position if there was a ceasefire and maybe eventual peace.
BTW, Hitler believed that the war was still winnable.
By this time we were pretty much committed to unconditional surrender, nobody had the heart by this time to cut out the Soviets, though I’m sure there were many who would have loved to do just that.