Consolidate your empire - take Sinope, Trapezous, and . Then rush Ipsos and Sardis - take them as quickly as you can. AFAIK one of these two, if not both of them, have mines, an invaluable bonus in your struggle against the Grey Death.

After that, take Antiocheia at all costs and blow up their MIC there. That'll stop their flow of guys and if you can hang on to it, all the better. Be warned, the Ptollies will often ceasefire with the Seleukids and declare war on you if you take Antiocheia, so don't be afraid to give it to the Hai - meaning either the Seleukids declare war on the Hai or Antiocheia stays out of their hands. You'll be going after the Hai later anyways.