Bummer. So far it looked great, and I was about to be convinced that fighting forward is an option without mulling and the big Lvov trick, and one that even might be on par with retreating.
It seems that BigA concentrated only on Leningrad and Moscow, so he will get at least the former by October. In turn he lacked the extra Armor to grab the Donez lowlands and Rostov. If possible, I would now be planning counterattacks around lake Ilmen, esp. near Novgorod and hope to create danger spots that will require the detachment of mobile units to clear, just as the Soviets did back in time. That seemed to work well, although now it is too late for Leningrad. He still got in there relative easily, although this may be just right given the Germans never truly attempted it beyond the initial assaults that actually succeeded in early September.
The area around Orel looks very worrying, though. PzGr1. fought hard and it being depleted is hopefully a good sign that BigA will have to choose, and he probably will go for Moscow as the south would be ideal tank country for the next summer.