The question you always have to ask yourself is this: "What's in it for them". I hit your blog briefly and my first impression was clean layout but very plain. Nothing to catch my attention and make me want to dig in further. I'd work on a new tag line. You site should immediately say: THIS IS WHAT MY SITE IS ABOUT AND THIS IS WHY YOU SHOULD READ MORE". You've probably heard the... Tell them what you are going to tell them tell them tell them what you just told them That formula works. So does the old sale formula... AIDA Attention Interest Desire Action You are in my opinion losing people at the Attention Stage. You have 8 seconds to make that happen. I'd bet with your same exact content, a tagline rewrite, and a splash of color to your theme you would improve readership.
i would suggest getting a new theme. also promote your blog more and join other bloggers and blogging forums, engage and promote.