Turning freelance hustle into a business

When you start a freelance business, you are a marketer, salesman, manager, strategist, and developer at the same time. I love that!
But because of all the process are tied to me, the second I stop working income stops.
I want to turn my freelance hustling into the business. And a key to the transition is to build systems.
Unfortunately, I can’t just clone myself or hire a person who will have all the necessary skills in one.
So I am now focusing on one process in time.
The first one I picked is building a flow of clients. Since without clients there is no business :)