Sounds pretty similar to my Baktrian loss, which was my first campaign.
Romans are easy, and they let you learn the game quickly... but I think they're too easy. Same with Carthage. Koinon Hellenon was my first real campaign I won, and its fun and hard, especially since I only took Greek cities/victory conditions and didn't just create a giant empire. You have to not go insane pitting hoplites against phalanxes early though. Makedon or Epirus can be good if you want to command phalanxes.
But my best suggestion would have to be play Sweboz. You're isolated, so you have time to build up a reasonable start position without worrying about the big dogs knocking on your door. But you'll still eventually have to face large stacks coming up from the south, which can be a challenge with a lack of superior ranged units and heavy cavalry, the two most human-friendly types of units. Plus, you get to play one of the barbarian factions, the full development of which is one of the things that sets EB above other mods. Sweboz was my third victorious campaign, and I found it a ton of fun. Probably a bit more of a challenge for a newer player, which is to the good. Especially if you play on huge settings, and have to manage depopulation, thus making heterogenous armies of various tribal levies.
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