I have a feeling that as active users increase, engagement becomes more exponential and viral in nature.
I agree, and it will likely come from new recruits keen to make others aware of their presence.
... what about having an initiative that directly seeks out and rewards quality comments with a decently weighty curation trail?
This should be happening right now, @anomadsoul kicked something off last week.
As far as your engagement, what I have noticed is that when you leave a comment, it is of substance. I think this is the best approach to the game 👍🏽