sudden drop in traffic

the problem is that by failing to update often your web you've got a drop of positions in Google. The first thing you need to do is not let go so long without updating your web and also get backlinks to your site

 

may you stop making backlinks , Find real source of traffic on your site.

 

Google frequently changing its algorithm then be it a small update such as Google Caffeine it might affect your traffic.

 

have u change in content or meta tag

 

when does you create your site? and if you had done something which is unfriend for Google or other Engine Search.

 

Do you update your content daily.