There is no quick way to get it. Period. Unless you buy contracts. Pound pavement, follow up, do it over and over and over again.
Buy a business (fast income, high cost), or build a business (slow income, zero cost).
The way I did it, was to treat it like a full time job, even when I had no work at all. Get up at 7am, start canvassing by 8am, don’t go home until after 5pm. Do that Monday to Friday every week. Soon enough you will find that piece by piece, your route is building. MAINTAIN!!! Keep the routine! It will take as long as it takes, but if you can survive, you will have the route that you need in time.