Perhaps you can learn something from this. A software tester friend of mine couldn't figure out how to start a business doing software test, so he fell back on what else he knew: construction. He started a side business doing small jobs: small decks, internal walls, installing dishwashers & appliances etc. This was all stuff he could do in his free time after work and he hoped to move from that to larger construction projects.

The overriding complaint he heard from his clients about other contractors was not that their work was bad, or that their prices were high or didn't match what they quoted, but rather it was that they just never showed up!

Simply by making appointments and actually showing up to quote the job or to do the work, he got tons of business.