It's often the case that you get some of the best work via leaflets.
When I first set up 5 years ago I canvassed with leaflets. Left one with a smallish house, the owner of which worked at an Accountants, got the accountants, from the accountants got a block of flats, from that block of flats got another one, and another and another, all in all £800 per month of work that I still do now, from one leaflet left in the right place.
It's numbers game, buy thousands of leaflets and put them everywhere