1. Concentrate to provide excellent technical support to existing customers. Happy customer will refer your website to others.
2. Do marketing of your web hosting website on web. Banner advertising, Forum posting, Directory submission, Relevant and quality link exchange, How to's writing, Blog writing etc are the core area.
3. Maintain the maximum uptime of your servers. Keep your servers updated with the latest technologies available.
4. Search on market and see what others are offering.