The previous section (ch. 13—27) was about the Fall of Babylon. But that is only important insomuch as there is something to replace it. Otherwise, Babylon would reestablish itself in short order.
This section is about how God will establish Zion and in particular, how the Word of God will transform the world. If I summarized this next section (28-35), it would be with this quote from Spencer W Kimball
“I am convinced that each of us, at some time in our lives, must discover the scriptures for ourselves—and not just discover them once, but rediscover them again and again.”
How Rare a Possession – The Scriptures! The Ensign Sept. 1976, 2, 4
And not merely learn the scriptures, but how they will transform society, individually and collectively. We must rediscover the power in the Word of God. Chapter 29 is attributed to the Book of Mormon, and this is true, but I wonder if it is broader than that. I suspect that when the Ten Tribes Return, they will see this as applicable to themselves as well.
Chapters 28 & 29 are the Doctrine and we see the Application in chapters 30-35.
Word of God Rejected, yet Taught: Doctrine (28), Application (30)
A Marvelous Work & a Wonder: Doctrine (29:1-14), Application (31-32)
Society Transformed: Doctrine (29:15-24), Application (33-35)