Myself: Once upon a time your blog had less number of visitors but many regulars who read everything you posted and offered their critics and comments.
Me: I think I finally found the reason. A blog can be considered read worthy only if it has anything new to read unless of course my blog post is a copy of the Bible. :)
Myself: So looks like you found your solution. New content is a must.
Introspection is the key to all answers :)
P.S: Watched Harry Potter 7 and looks like the saga has finally come to an end. We will all miss Hermione Granger thats for sure :D