Jamieson, Fausset and Brown on Jeremiah 30:8

8. his yoke ... thy neck--his, that is, Jacob's (Jr 30:7), the yoke imposed on him. The transition to the second person is frequent, God speaking of Jacob or Israel, at the same time addressing him directly. So "him" rightly follows; "foreigners shall no more make him their servant" (Jr 25:14). After the deliverance by Cyrus, Persia, Alexander, Antiochus, and Rome made Judah their servant. The full of deliverance meant must, therefore, be still future.