I tell all my current families that they'd better start referring or I'm retiring
. Just kidding, but word-of-mouth and referrals have kept me full for a long time.
I do see a lot of providers here marketing on Facebook, so there must be something to that.
There are a couple of large employers here who have their own internal referral system, so you could call any large companies in your area to see if they have something like that and if you can place your name with them.