We tend to get distracted after small achievement by the false impression that we achieved the purpose. However, purpose is not a goal. It's a bigger word. The goals and the achievements serve the purpose.
Nehemiah and the Israelites finished the rebuilding the wall of Jerusalem. It was a great achievement. Yet, it wasn't their purpose. Their purpose was to live as people of God. And the wall was supposed to serve the purpose. That's why Nehemiah didn't go back to Persia, after the construction ended.
For the purpose, Nehemiah appointed two rulers who fear the God and love the people in chapter 7.
And in chapter 8, the people of Israel gathered to listen to the Word of God. With the desire, many people gathered, spent 6 hours to listening, responded 'Amen,' and understood the Word. That's what happened. And we should have the same desire for the Word of God.
When they understood the Word, they wept for their sins. But Nehemiah and Ezra talked to them, 'not to weep, but enjoy the festival' based on the Word. And they listened to it. Obedience should prevail over the emotion.