I worked for a billing company that had a Youtube presentation video linked to their website. I don't know that it really did any good, because the company went under, but they did this other thing on their website that I thought was different, that you may want to try.
After they got their first client, and the client was happy with their services, they did a voice recorded testimonial from the client, and added that to their website. It was the doctor and his practice administrator, taking turns talking about how happy they were with the billing company and their services, etc.
You have five clients, so maybe some of them would want to do something like that for you.