What are the good techniques to get theme based traffic
 

I read many times that Google gives priority to theme related back links. How can I do it? Please help me. My website traffic suddenly down to less than 1o visits daily, before ten days it was 150 visits daily. what can i do to get it return.

Theme base means same niche websites..Do some forum posting, blog commenting etc. on some sites that are same to your site niche..