Ok first, that's hilarious!
Moving on, Hippolyta sets up Ares motivation by telling us when humans were created he was jealous of them. As I mentioned upthread, he is rather similar to some representations of Satan, who resent God for creating a creature that is loved more than he are. It's also not dissimilar to Loki in the MCU, whose primary motivation is to outdo Thor.
And like Loki in the first Thor movie, his strategy is to lure the focus of his jealousy into revealing the worst side of their nature. Ares mentions that he wanted the other gods to see humans for what they were. So his original plan seems to have been that through the ugliness of war he will turn the gods against humankind. When They create the Amazons instead, it ends in a battle where Ares is the last Olympian standing but to weak to commit the genocide he craves. All he can manage now is to play the role of evil tempter.