You could get even more specific by narrowing it down to customer base. Is there a specific group of clients you tend to serve? Try including that in your long-tail key phrase. For example: “SEO agency for non-profits in Albuquerque NM.” That’s a key phrase you’re a lot more likely to rank for. Not to mention it will also attract way more targeted, organic traffic than a broad key phrase like “SEO agency.”
At our agency, we work with sites of varying sizes, from very large to quite small, and recently, we have noticed a trend at the enterprise level. These sites aren’t relying as much on Google for traffic any more. Not only are they not relying on Google traffic, but also, the sites are getting less than 10 percent (or slightly more) of their organic traffic from the search giant.