If you are in hosting business then web hosting forums, webmasters forums and web design forums are best place to have ads on. You need to find high traffic sites that related to your niches to advertise.
For example, you will get nothing if you advertise your hosting services on a site that offering weight loss niche and vise versa.
After reviewing your site I found its a well design web hosting website as it should be. There is not much difference with these kind of website these days thou but yours stand out. You can add more resources and take advantage of the announcement option until you have finish updating your website. I recommend to focus on the WHMCS portal as your landing page for sales as that stand out more.