I think the current faction roster is fine (as long as you can get the Getai to do something) and would prefer to see emergent factions.
Possibilities for those are:
Yuezhi
Numidia
Persians
Roman rebels (after Marian Reform)
Bosphoran Kingdom
Judean Rebel
Celtic/Germanic migrations
and a whole raft of other factions already mentioned in this thread.
You could possibly demote Pontos to an emerging faction as well.
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