It seems maybe a slight possibility of you are relying on an already established audience.
Who really reads posts to know what is going on.
If you are not offering the rewards people do not give a shit.
If you are offering rewards people will come take them buffer off and not even leave a fart, in case you can gain from it.
So, is it volume of people or the interest of people.
Depending on, is what way to design your show to bring the audience you want.
The same people or new people.