In verses 10-13 Yahweh speaks to Israel's enemies. This can be made clear in the quotation. Alternate translation: "You enemies of Israel, go up onto her vineyards' terraces" (See: [[rc://en/ta/man/translate/figs-explicit]])
Yahweh speaks of Israel and Judah as if they were a vineyard and the people there were vines. Alternate translation: "Go up into Israel and Judah, which are like a vineyard to me, and destroy them" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The word "their" refers to the vineyards. Yahweh speaks of the people of Israel and Judah as if they were vines. Alternate translation: "like farmers who trim the vines of a vineyard, you must remove many of the people of Israel and Judah, because they do not belong to Yahweh" (See: [[rc://en/ta/man/translate/figs-metaphor]])