You could try adding more civs to the game, or more city states. Less empty space would cause this to relax a little bit.Earth. Every time my first city is in a isolated place, for Odin's beard, a swarm of barbarians, not impossible to handle but REALLY frustrating, and man, turn 60-80 they sometimes are already with lancers and everything, wtf. Can't deal with promoted units at this stage popping one after another. Tried one last time, gave up, last game I found like 4 encampments before turn 30, I was in a isolated place but, man, too much on Epic.
Or play a more typical map, like Pangea or Continents. I usually the barbarians are just right on these maps