Continuing the discussion from Introduce yourself (or at least just say hi):
The hardest part is learning everything you can about your audience. Who are they? Why are they here? What do they react to (type of topics)? Demographics? Education?
You can do this on an individual basis if site is small or as a group.
Once you learn everything about your audience create topics that’ll pique their interest. Create an atmosphere where similar people can share ideas, stories, questions, etc. eg. create new sections, maybe?
Focus on multiple traffic channels to get more people to the site. Organic search is obvious but newsletters, email, and social can also bring in traffic.