Missed-call text-back for a child care center
This is the structural problem in child care and no ad platform fixes it. The hours parents call are the hours your staff are legally required to be in a classroom. A director does not miss a call because she is busy. She misses it because she cannot leave an infant room and stay in ratio.
Parents do not leave voicemails. They call three centers in a row on a lunch break and the first human voice gets the tour. Treat a voicemail as a courtesy some parents extend, not as a lead source.
Missed-call text-back costs $20 to $80 a month and is the highest-return item on this page. The call rings out and within twenty seconds the parent gets a text: sorry we missed you, we are with the children, text me here about openings or a tour and I will reply within the hour.
Then speed. Text within five minutes, call within the hour, and offer two specific tour times rather than asking when she is free.
Put your own tuition and inquiry numbers into the missed-call calculator and look at the annual line. In this trade it is almost always larger than the entire marketing budget.