What does Joel 2:21 mean?

Then Yahweh was jealous for his land, And had pity on his people.

Yahweh answered his people, “Behold, I will send you grain, new wine, and oil, and you will be satisfied with them; and I will no more make you a reproach among the nations.

But I will remove the northern army far away from you, and will drive it into a barren and desolate land, its front into the eastern sea, and its back into the western sea; and its stench will come up, and its bad smell will rise.” Surely he has done great things.

Don’t be afraid, you animals of the field; for the pastures of the wilderness spring up, for the tree bears its fruit. The fig tree and the vine yield their strength.

“Be glad then, you children of Zion, and rejoice in Yahweh, your God; for he gives you the former rain in just measure, and he causes the rain to come down for you, the former rain and the latter rain, as before.

The threshing floors will be full of wheat, and the vats will overflow with new wine and oil.