What does Isaiah 49:11 mean?

Yahweh says, “In an acceptable time I have answered you, and in a day of salvation I have helped you. I will preserve you, and give you for a covenant of the people, to raise up the land, to make them inherit the desolate heritage,

saying to those who are bound, ‘Come out!’; to those who are in darkness, ‘Show yourselves!’ “They shall feed along the paths, and their pasture shall be on all treeless heights.

They shall not hunger nor thirst; neither shall the heat nor sun strike them: for he who has mercy on them will lead them. He will guide them by springs of water.

Behold, these shall come from afar; and behold, these from the north and from the west; and these from the land of Sinim.”

Sing, heavens; and be joyful, earth; and break out into singing, mountains: for Yahweh has comforted his people, and will have compassion on his afflicted.

But Zion said, “Yahweh has forsaken me, and the Lord has forgotten me.”