Not mentioning what makes you different, your USP.
When I’m doing online research for a particular product or service, I want to know right away what makes any company unique or different from their competition. Most virtual assistant websites just display a whole list of services they provide. While I agree that you do need to let your prospects know all the bases you can cover, if you love designing databases or have a passion for project management, tell the world about it on your website.
The beauty of this is that you will then tend to attract clients that need those services so you will be doing more of what you love. How great is that?