Here "Valley" refers to those who live in the valley, that is, Jerusalem. AT: "about those who live in the Valley of Vision" or "about those who live in Jerusalem" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Isaiah uses a question to scold the people of Judah. AT: "You should not go and stand on the tops of your houses." (See: [[rc://en/ta/man/translate/figs-rquestion]])