Well the thing is that like nobody knows them and thus not many people care. Everybody knows about vikings, everybody knows about roman empire, everybody knows about japan, everybody knows about Egypt, Greece etc.
But for example Turkey? Russia? India? Iran? And Africa has tons of countries but the most well known one probably Ethiopia I think. I think there is just not enough exposure and thus no interest in that. Even well known countries - like France - are portrayed in movies basically about either revolution or Napoleon. And all that while there was a bunch of Frankish kingdoms and ancient regime with its long history. And even with UK you have either Tudors or Richard I or fantasy about Arthur.
Unless those countries and regions will start exporting more of their culture, it will be all the same movies because there is just no interest in anything else.