There is diarrhea on my building, trash in the street, people needing medical help in the alley, and potholes in the street.
Just walk out your front door and start doing things.
My recent triumph was getting a building owner on my street to finally repair the hole in front of their building. Imagine what I could do with a backhoe.
Start small, think big. Help people who deserve it in real, honest (typically not through the computer) ways.
I'd much rather be less wealthy in that way to be rich in this way.