It was hard in the beginning, but later in the game greeks rule all over the world. You don't need to build too many militay buildings like the romans ( no new units in higher buildings ) and armored hoplites + greek cavalry + archers kill everything.

I managed to get 40 regions. I couldn't figure out where to invade next. Everywhere is so far away from my capital. I have trouble ruling them. Too many rioting. Any tips or advice on invasion and diplomacy ?

notes on diplomacy : i have no allies or proctrates, two diplomats one in germany region, one in anatolia.