What am I doing wrong???

I started my first blog (IM project) about two years ago. First year I made just over $1,000, second year I made about $1,500. I was thrilled with the first years results, but really think I should be making more now. I know my site has a lot of potential, just don't know what to do to get over the place I am at now with it. I had never even heard of IMing before starting this blog in desperation to make extra money!!

First year I was typically getting 300 unique visits a day (from about month three on). Second year I got all the way to 800 views a day. This lasted about two or three months before the traffic started to drop again. The traffic was a direct reflection on how I was ranking in google at the time.

I have really neglected the site (due to being pregnant and starting a new job), but have recently started working on it again.

I post in forums related to my niche and am starting to post more on related blogs. What I am wondering is why did my site rank so well in the beginning, even when I was not doing much and now it is not?

If anyone would like to take a look at the site and give me any tips I would appreciate it. Thanks in advance!!! (site is in my signature)