Your business is located in a great area. Some options for you would be:
-Join a networking group for small business owners.
-Use your vehicle as part of your ad campaign (and yourself as well).
-Make some t-shirts, pens, water bottles with your logo and information and then distribute them to your current clients and also to various chiropractic offices, medical offices, massage places, etc.
-Donate some sessions to a local non-profit organization so they can use them as part of their silent auctions for fundraising.
-Place an ad on Craigslist (this has been very effective for me).
-Put up brochures/flyers at various coffee shops, athletic/sports stores.
-Join your area’s chamber of commerce.
-Have an open house once a month until you get really busy.
Some or all of the above methods could work for you, so you’ll have to decide which ones would be the most efficient for you. I hope this helps.