Arise and thresh, O daughter of Zion: for I will make thine horn iron, and I will make thy hoofs brass: and thou shalt beat in pieces many people: and I will consecrate their gain unto the LORD, and their substance unto the Lord of the whole earth.
Micah 4:11 Now also many nations are gathered against thee, that say, Let her be defiled, and let our eye look upon Zion.
Micah 4:12 But they know not the thoughts of the LORD, neither understand they his counsel: for he shall gather them as the sheaves into the floor.
Micah 4:13 Arise and thresh, O daughter of Zion: for I will make thine horn iron, and I will make thy hoofs brass: and thou shalt beat in pieces many people: and I will consecrate their gain unto the LORD, and their substance unto the Lord of the whole earth.
The verse centers on "arise", "thresh", "daughter", "zion", "make", "thine", "horn", and "iron". It is saying that the verse draws attention to "arise" and "thresh", so its meaning should be read from those terms before moving to application.
The prior verse says "But they know not the thoughts of...", giving immediate footing for "arise" and "thresh". In Micah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "arise" and "thresh" with trust shaped by these words, not by a vague optimism outside the passage.