I certainly want art, including my art, to be a contribution to...humanity, humanity's well-being, spritual evolution.... Is that too broad a target? Although in practice it isn't so broad, because those of us who are serious but not world-famous blockbusters tend to appeal to a self-selecting, relatively small group.
I used to think, being inclined to being solitary, that art-making was a good choice: I could send the work out into the world and stay hidden myself. (I have two actor brothers who have to put themselves physically on display to do what they do--terrifying.) That doesn't seem to work very well. At least, actual human contact does seem to make a difference.