Marketing is only worthwhile if you see results from it. This is the same with any business activity, but with marketing, which is designed to draw in more customers, it is a completely wasted effort if you do not see the results. That being said, you can also raise brand awareness from marketing, making people know that your business exists. The trouble with this is that it is incredibly difficult to monitor the results.
You could consider spending money on brand awareness, and over time, you should begin to see more customers coming in. One way to tell where they are coming from is to track traffic. Assign different phone numbers to different campaigns and analyse the traffic on your website to see where it is coming from. The best thing to do is to drive organic traffic to your website, as you won’t then be having to pay out money for pay per click or paid social media advertising.