I got off a call the other day.
The person calling said, "Ken, I've been getting your emails for awhile. I don't always open them, but your brand shows up regularly, and I knew when I needed a service like yours, I knew you'd be there for me. And now I need your help."
She's now a client.
All you need to do is show up regularly.
So the point is this:
Send an email to your list on a regular basis.
It doesn't have to be long.
It just needs to show up in their inbox.
It builds confidence that you'll be there when they need you.