Thoughts from a couple of Getai campaigns on 0.81...
Your heavy phalanxes can pin the serious Mak/Epeirote/Seleucid phalanxes in a way that's beyond your other troops. Then your many good+cheap close quarter infantry can swarm around and butcher them. I found them a great comfort, I wasn't muttering "oh god I hope the line holds" every fifteen seconds.
Skythian horse archers from Kallatis and Olbia are also very useful. Phalanxes make good archery targets, HAs can get themselves out of trouble, they lure enemies to divide their forces, and the Skythians are really cheap. They're good for hunting routers too, so you don't have to fight the same troops twice.
Try to build the experience on some slingers. Due to a statistical peculiarity their attack doubles when they get a couple of chevrons. If you can last long enough to get them up to silver or gold, their armour-piercing bullets will do a real job on the back of a pinned phalanx. And they're cheap.
If you can get a predictable choke point -- a river, a fort, a town wall -- try to hire mercenary hellenic medium phalanxes to hold it. That will get you an exceptional kill ratio.
The best results I've had with the Getai in field battles used a simultaneous combination of feinting horse archers to tie up (and wear down) a part of the enemy, while the phalanxes and infantry did successor style "pin and flank" to slaughter manageable chunks. I fight a battle of manoeuvre to keep most of their army busy while I do a meatgrinder job on a manageable chunk. Repeat until done.
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