I try to take what the Russians give me looking for mistakes and chances to slaughter infantry more so than take over Russia. Sorta like a chess game where you play to get up in piece value instead of really planning a mate. I might threaten that blitz into Moscow but really I’m just looking to slaughter a medium stack.
Given the opportunity I will take advantage of the greater German mobility. Taking Lenningrad one turn with help from my Sealion navy then sliding south.
If/when Russia turtles back into Moscow I love it! From previous games I fell in love with sending a dozen German tanks (& now a few mech inf!) into India. Russia turtles I slide into Stalingrad then further south. German armor can swing into India and eliminate an allied economy or at least tip the African balance.
My Germany looks scary offensive but is just preparing to absorb Allied landings and stalling so Japan can run across the board.