An audience isn't a collection of numbers
Building an audience and building an engaged audience are two different things. Audience growth is about attracting people. Audience engagement is about giving them reasons to interact, return, participate and develop a relationship with your brand.
Organic marketing can be brilliant for getting discovered, but attracting attention is only the beginning.
Think of it like opening a pub. You've spent months advertising the grand opening. Four hundred people queue outside. Then they walk in and discover there's no music, no conversation, no atmosphere and absolutely nothing to drink.
Bit awkward. Getting people through the door is one thing. Giving them a reason to stay is another.