imo there are different possibilities
camel / slinger stay defensively and everytime he tries to attack send some camels (2/3) in his woodline or far hunt.
other possibility is trying to pull off a fast age, scout what he is making vs sparabara/bow go slinger + chariot archers and vs asabara/bow go camel/chariot archers. Micro like a king and u will come out on top.
Age2 his combo is defintely better, so try to reach age3 eventually where you go eles + chariot which destroys persia army.
if u ever end up in a bow + sparabara fight vs slingers + axeman, try to split your slingers in 2 groups and flank with some slingers his bows from the side. Slingers easily waster all their dps on the sparabara if u dont micro them.