Opening moves as Makedonia:

1. Empty Thessaly and Makedonia, and use that army (which is quite nicely balanced) to kill Pyrrhos. Then march westwards and conquer Epeiros.

2. Meanwhile, use your navy to reinforce Antigonos with troops from Mytilene. Then sail westwards (bashing other navies en-route) to bring back the conquerors of Epeiros so that they can take Thermon. Conquer Athens and Sparta with Antigonos and his men.

3. Loot Thermon. Sack it. Even the nice unique buildings. By 270 BCE, you can start rebuilding the mines in Pella.

It's a risky set of moves, but it'll make the kingdom of Macedon strong.