Chances are there are therapists in your town who specialize in something you don't, and vice-versa. If it's obvious your client would benefit from lymphatic drainage or orthopedic massage, or you have a client who is interested in shiatsu, for example, and you don't do that, don't be afraid to refer them to someone who does. If you have a niche practice, and you only do pregnancy massage or sports massage, refer the other people who call you to someone else. That will come back to you in the form of mutual referrals.