Huh? I don't get it. Which part of your website does the 'bad' SEO? Aren't you doing the updates on your own sites?
If you'd like to send me your site details and target keyword, when I get a chance I will send back an optimization report for you, free.
It's not a matter of domain names, you said it yourself, you don't even update it anymore. You weren't thinking of it to magically rise in the searches without doing anything, right?
Actually in order to give you a more accurate and to the point reply, which states what exactly the you are doing wrong, I want to see your webmaster baklinks report. This way I can come to know what all you have done In which manner, and I can tell you what all you missed out on, and what all needs to be rectified.
I had a look on your website and all I see are loads of links while some of them are pointing to external websites. Ever thought putting up unique content on the homepage to increase its relevancy while decreasing to the total number of links as well? The number of links on your homepage doesn't look natural to me.