Ask for the sale!!
(Please note the TWO exclamation marks above. Considering that I rarely use exclamation marks, and consider them crass, this will show you how important I think tip #4 is...)
I'm always amazed when writers create a good site, then spoil it all by not asking for the sale, and worse, making it all but impossible for potential clients to get in touch.
Is your website working for you? Make it easy for your clients to respond.