Marketing your business is a very hard thing to do and it never ends. You always need to be out there promoting your services. For example you need to be careful where you spend your time and money advertising, there is no point of advertising game servers at a gardening website for old people :) Teenagers are the ones playing games but don't tend to have much money so the market can be harder. Maybe try focusing on a different age group or sponsor some events.

Advertising online isn't always the best way!