We have heard of such a phrase where 'content is king'. This applies to online marketing. The reasoning is that by offering useful information to the web community, google will rank it higher.
Domains are an important part of your web page, one of the most important parts because it is the address individuals will use in order to load your page.
Who are your customers? Who is coming to your site and how are they getting there? How many of them are purchasing services or products? How do you know?
Writing articles is a powerful, free way to promote your business. Because articles are a news source they are much more credible than a paid advertisement.