The one thing I think a person can do to mnake a positive inpact on humanity is to Show compassion, and be excellent to eachother to quote Bill and Teds Excellent adventure.
If we, as people, take the time to treat others with compassion, and to help those in need, then our litle actions can can influence the personed helped to pay if forward, and those actions can be multiplied.
If we take the time to help each other, then we can be excellent to each other, we as humanity can be better