The return on investment from advertising, adwords, and newspapers is dropping. Interrupting people doesn’t work as well as it used to

If you’re not getting the results you want, try word of mouth instead.
It’s a great way to get more business. Instead of spending money on ads to people who don’t know you or your work, why not leverage what you’re already getting? Set up a referral program, encourage, reward the referrals you get. Tell your customers who would be a good referral for you, explain what you’ll do with the information, and how you’ll follow up.

More on this here: Your Customers are Your Most Effective Sales Force.