More succinctly: Nothing about free speech requires ANYONE to hear you. If you cannot convince people to listen to you, that is not a violation of your speech.
That disengenuiously misrepresents the problem of cancel culture. Cancel culture is the propagation of a vocal minority conspiring to stop certain topics being discussed, i.e. deplatforming. What cancel culture should be is that some shill hawking defunct idea's can't sell enough tickets to a talk to cover costs and therefore stops, or they end up with no followers and no audience, not someone else taking away my ability to hear certain topics.