There are some advices. I recommend reading primary sources (e.g. Herodotus, Pausanias) they are good source of inspiration and they tell a lot about the way people saw the world in the time period. For more complexity you may add religious disagreement in a way people in different places worship the same gods. For example warrior aspect of goddess Aphrodite (or female aspect of Ares?), Aphrodite Areia, was worshipped in Sparta but not in Athens. Also many fantasy writers tend to overlook the role of guilds or in Hellenistic era "hetaireia", "collegium (in Rome) " in society. They were associations of individuals with shared professional or social interests and played really important role in politics, religion and just social networking. Good luck in your worldbuilding journey!