I would follow the original plan to keep 1st army in defense while 4th army moves towards Budapest as in operation Goulash. The new question is what to do with 2nd army. I would say take the southern flank of Hungry to speed up operation Goulash. Then while 1st and 4th armies and commence operations Scniznel and Brats 2nd army moves east towards Bucharest or fights alongside 4th army in operation Brats. We'll see what looks like the most attractive option at the end of operation Goulash.
A landing on North Western Europe would be welcomed.
A landing on North Western Europe would be welcomed.