Here's a radical idea.
When launching your next piece of long-form content, hide a candy bar in it.
What I mean, hide something in the content to extrinsically motivate people to take the time to actually digest the content and experience the true value of what they're reading.
Give them a Willy Wonka golden chocolate bar moment.
What could you hide? Not sure. But make it meaningful and connect it to your brand and/or what your ideal customers care about.