Arise and thresh, O daughter of Zion; for I will make thy horn iron, and I will make thy hoofs brass; and thou shalt beat in pieces many peoples: and I will devote their gain unto Jehovah, and their substance unto the Lord of the whole earth.
Micah 4:11 And now many nations are assembled against thee, that say, Let her be defiled, and let our eye see [our desire] upon Zion.
Micah 4:12 But they know not the thoughts of Jehovah, neither understand they his counsel; for he hath gathered them as the sheaves to the threshing-floor.
Micah 4:13 Arise and thresh, O daughter of Zion; for I will make thy horn iron, and I will make thy hoofs brass; and thou shalt beat in pieces many peoples: and I will devote their gain unto Jehovah, and their substance unto the Lord of the whole earth.
The verse centers on "arise", "thresh", "daughter", "zion", "make", "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.