the voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the voice of those who say, ‘Give thanks to Yahweh of Armies, for Yahweh is good, for his loving kindness endures forever;’ who bring thanksgiving into Yahweh’s house. For I will cause the captivity of the land to be reversed as at the first,” says Yahweh.
Jeremiah 33:9 This city will be to me for a name of joy, for praise, and for glory, before all the nations of the earth, which will hear all the good that I do to them, and will fear and tremble for all the good and for all the peace that I provide to it.’”
Jeremiah 33:10 Yahweh says: “Yet again there will be heard in this place, about which you say, ‘It is waste, without man and without animal, even in the cities of Judah, and in the streets of Jerusalem, that are desolate, without man and without inhabitant and without animal,’
Jeremiah 33:11 the voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the voice of those who say, ‘Give thanks to Yahweh of Armies, for Yahweh is good, for his loving kindness endures forever;’ who bring thanksgiving into Yahweh’s house. For I will cause the captivity of the land to be reversed as at the first,” says Yahweh.
Jeremiah 33:12 Yahweh of Armies says: “Yet again there will be in this place, which is waste, without man and without animal, and in all its cities, a habitation of shepherds causing their flocks to lie down.
Jeremiah 33:13 In the cities of the hill country, in the cities of the lowland, in the cities of the South, in the land of Benjamin, in the places around Jerusalem, and in the cities of Judah, the flocks will again pass under the hands of him who counts them,” says Yahweh.
The verse centers on "voice", "gladness", and "bridegroom". It is saying that the verse draws attention to "voice" and "gladness", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "Yahweh says Yet again there will be..." into verse 12's "Yahweh of Armies says Yet again there...", so "voice" and "gladness" belong inside that flow. In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "voice" and "gladness" with trust shaped by these words, not by a vague optimism outside the passage.