I don't.
Very rarely I might put some keywords in the description to help the google bots along (I think maybe I've done it for a couple addons?)
Other than that I don't go looking for users, I try to make my description to the point and let users find them.
I'm actually pretty happy when I see some downloads and no comments, means I don't have to fix anything
Plus my overall disposition is that I make addons for myself and my guild, others using them is a fortunate by-product.
I do try to respond to reasonable feature requests even if it's not something directly useful to me.