Try to promote it better so that more people will actually know about it. Try to write a press release, post on related forums, comment on blogs etc. The better your website is known, the bigger the chances to boost your income.
It's depends how we work for the presentation of the website and our domain, to boost the web hosting sales, we need to work with prolific and with immaculate skills.
Firs your domain should be well know to all; at least for the people who are in the field which domain actually related. Have some quality content on your website.