I've been looking at our site stats and it seems we have been pretty flat for the last year.  

What are people doing to increase viewers?  

Any tips?  

Thanks. 

We advertise our site on other sites with similar interests.  We also make sure those sites cater their ads to their community's interests and don't just post a google ad-sense code for random ads.

Posting interesting community content to social media drives some additional traffic to your site. However, do not expect that those visits turn into new members.
While this can work well for you (e.g. if you serve ads in your community), be aware that creating good content requires considerable amounts of time. So does the maintenance of social media profiles.