Consult Your Clients Directly About The Service You Provide
You can start by sending your most loyal clients an email asking them, for example, what makes you stand out, that is, what you have done that they have not seen in any other law firm. Don’t settle for generic responses like “I’ve known you all my life,” or the like. Make sure to collect strong arguments, and once you have them, start evaluating how your service can be even better and, consequently, irreplaceable.