I would shrink the scale of the map sigificantly so that its based far more on the Mediterannean and add many more provinces to historically key areas, meanwhile losing Britain, Arabia, the Baltic and anything east of Iran. That would remove Saka, Saba, Casse and Baktria. I would replace them with Numidia, Belgae / A N Other Germanic faction, Pergamon and a "Western Koinon Hellenon" faction which included Syracuse. Optionally I would remove Epirus and add the Boii.
If we kept the map the same I would second the suggestion of removing Saba and the Casse - making Britain and Arabia one province each. I would add Meroe to counter the ptolies in Egypt (historically they successfully resisted all invasions of this time including from the Romans at the height of empire) and add a faction to central northern europe. Hopefully using BI - the Cimbri as a horde.
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