Don't fear dom deity in Civ 6, it's been the easiest path of victory for me. Your biggest worry early on is the barbarians which says a lot about how bad the AI civs are. After the 3 slingers to archer upgrades and if you have horses then build a lot of war chariots with the Maneuver 50% reduction policy, find iron and save up your gold. Time stirrups with Professional Army and upgrade your chariots to knights at half cost. They will wreck most everything. Make sure to make a siege tower or two and don't lose them. At some point in the game you can't make them anymore.