Well, putting on my wargamer's hat I would forge on straight to Moscow and send only a minimum force North towards Leningrad and leave AG South to fend for itself; a Kiev-Crimea axis would be more than good enough.

Failing to take Moscow, which is entirely likely I'd rally on an advanced line as soon as the mud came in and regroup for the new offensive next spring while preparing to reequip in view of the superior tanks met, getting rid of the 37mm and short-50 PzIIIs and short-75 PzIVs, 37mm PaK, etc. Also most important get loads of witer clothing ready in time!

These are only the most obvious steps, there would be a lot more, first of all pulling my hair out for having got into this Barbarossa trap in the first place

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