See there actually exist people with good intentions, worried about the suffering ones, about the animals, and that believe they can help change something for better, even if in little moves
If I were Mayor, I'd make the world a better place by
Change education standards completely, to make it more effective, more appealing to children, more complete. As Dalai Lama once said, focus their education also on things other than "exact", numbers sciences, and teach subjects on cultures, spirituality - not religious tenets, only subjects to think, reflect upon, quiet down the mind etc -, philosophy, also some introductory psichology to help them start to know themselves etc.
Also much more art content (theoretical and also practical) and more activities out of school, to get to know their city and participate, help etc.
What/who changed my life and why
Many (and very diverse).
Buddha, Socrates, Krishna, and some other, regarding philosophy of life and thought.
Albert King, Buddy Guy, Hendrix, Kurt Cobain, Bob Marley etc, regarding music.