The truth about marketing, whether online or offline is that its impact grows over time. You are able to reach more and more people over time.
Marketing efforts must never be judged by their immediate impact alone. What we need to do is to effectively build the campaigns on top of each other, to ensure the steam never runs out and we have to start all over again.
People who seem to pay no attention to all the “noise” you are making now will call you up soon to mention that they saw your messages and want to patronise you.