The reality is that if you take care of the customers you already have then your business will grow with them. The existent clients will ask you to do more for them and they will then tell their friends.
A good rule of thumb is that 80% of your business comes from 20% of your customers. You can see the potential for growth right there!
Be the company that others recommend!
The link below is from infoentreprenuers.org. It contains an honest starting point for small businesses to become customer-centric.
There is nothing flashy about what they have to say, just good old plain english to help small business owners make changes to their business that will add positive value to their bottom line.