What exactly have you done so far to improve its rankings? I don't see any content in it so that in itself is a problem. Try to put in a para graph or so incorporating your relevant keywords. Since its a local domain, have you registered your site on local listings and relevant directories?
I think you have work on the Meta Tags (Title, Descriptions and keywords), because in rapid changes in the meta tags will disturb your website ranking..........
If you have been consistently working on your site ranking, then don't worry too much. Your site ranking goes down is just temporary, you will soon notice that it will rise again. Google did that all the time and I did faced the same experience with few of my niche sites. Most importantly, you should be consistently building backlinks to your site and if possible from authority sites. You can't go wrong.
u should get seo services so that ur site keywords could come in higher position so that vistor will visit ur site