Not everyone has the time or resources to go out and change the world, but it starts with a small step. Being a decent human cost zero dollars, and takes up zero extra time. It's quite simple: be kind, be educated, and step in when you can. Change what you do not like, and the world will change as well.
The best version of this world already exists. It's beautiful and filled with good people, but that beauty and good gets hidden by the baggage of hate, resentment, fear and anger we dump on it each day. We can't wipe out these feelings, but we can lessen their destructive power with the power of love.