First - don’t panic.
Consider scrambling with the UK if they bought all ground.
Buy inf and air and a few mechs with Russia and fall back to Moscow. Counterattack naked tanks if you got some lucky defense dice on G1.
Make sure your northern forces don’t get encircled and killed in Novograd, fall back immediately.
Stack up and calc. if you can hold a turn extra in Belarus or Bryansk along the way using air in defense as well. This can be invaluable.
Try to hold Bryansk and trade Urk. and W. Urk with air and inf so Germ can’t build factories. Or let Italy take them. Even better.
Grab Iraq and Italian Som./Tobruk with Russia for extra IPCs from the NO. Maybe use Persia infantry and a bomber to take Iraq or have the UK strafe it. Bomb the Novograd factory.
Use the UK to try to keep clear sz. 125 for Russia. Then Russia can use mechs to clear Archangel and keep the NO.
Retreat the Siberan infantry. If they get there in time, fine, if not, then they can block a tank stack towards Cairo or help China from behind.
Get enough of a fleet together as the allies to take Norway or Persia and build an airbase/factory combo on one of them and start shucking fighters direct to Russia.
Get the USA up and running in the Pacific the first two turns if it’s a J3.
Attack 97 with the UK and try to cripple Italy.
Just some thoughts. Perfectly played Axis with good dice is hard to beat, but usually they get a bad dice result here or there and then you build off that opening. Good luck!