Promoting Steem to the wider community is the most logical way, @hungry-griffin. The charity movement that helps a lot is also a form of contribution to the wider community as a way of attracting many people to get to know the platform and also Steem. You can see @steem.amal and @worldsmile for reference, they run humanitarian projects consistently, projects that can introduce Steem and Steemit and most importantly contribute to society.