+1

Disband your navy. Disband all cavalry except units that can win a field battle. Recruit pikes in Pella to shore it up and hold (or frighten off) the Epeirotes. Besiege Athens with whatever starts next to it and anything you can spare out of Demetrias and Chalkis.

On turn 2 storm Athens -- build ladders, take the walls with heavy armoured close combat troops (pikemen have swords and decent armour), take the missile towers so it's safe to move your missile troops up the ladders. They can fire down from the walls to keep defenders at bay as the phalanxes assemble in the streets. Pike phalanxes are the ultimate street fighters with their flanks secured by walls, just grind down main street and they will chew anything the KH can throw at them.

Enslave Athens (make sure you have governors in the cities you want the slaves to go to), and move towards Sparta in turn 2 linking up with troops out of Corinth. You should have Sparta by turn 4 or so, and you can then strip everything south of Demetrias to bare bones garrisons and shift your army to fight Epeiros. I killed their elephants with one volley of javelins from behind by the lowest form of skirmisher. It was a bit anticlimactic...

Once Epeiros are out of Greece, start knocking off rich or strategic Eleutheroi provinces. Try to make peace with the KH/Epeirote remnants in exile so they're less likely to send a fleet at you.