What does Haggai 1:9 mean?

'You expected a lot, but it turned out to be little. And when you brought it home, I blew it away. Why? Because my house is still in ruins while each of you is busy with your own house,' says the Lord of all. Haggai 1:9 - Modern Text Bible

(God explains that their lack of blessing is directly tied to their neglect of his house—they’ve put themselves first, and he’s withheld prosperity as a result.)