I will start with bettering myself. Everyday we need to strive to be better people. No one is free of sins..this is true. But when your downfalls affect others,causing pain and suffering, then it's not just any sin but a social evil that needs to be done away with.The obvious social evils are clear:murder,stealing,rape etc. But what of those so called lesser wrongs that unbeknownst to us can cause much strife and problems. Be it arrogance, racism, slandering and gossip..these are the kind of social evils we often ignore or play down in ourselves and yet our behavior will be causing ill effects in the lives of many.
So if I can stop myself and then my family from doing such evils that will be my little contribution in making the world a better place.
And of course taking advantage of any given opportunity to verbally or physically promote good and/or forbid wrongdoings. Any small effort towards making life better for another will never be in vain!