You can improve your community just by starting with yourself.
Show everyone kindness and respect. Treat everyone with kindness and respect, even those who are rude to you – not because they are nice, but because you are. There are no boundaries or classes that define a group of people that deserve to be respected. Treat everyone with the same level of respect you would give to your grandmother and the same level of patience you would have with a child. People will notice your kindness and it will most likely produce positive results.