Go - not actually; but turn and proclaim towards the north (Media and Assyria, where the ten tribes were located by Tiglath-pileser and Shalmaneser, 2Ki 15:29; 2Ki 17:6; 2Ki 18:9, 2Ki 18:11).
Return ... backsliding - Hebrew, Shubah, Meshubah, a play on sounds. In order to excite Judah to godly jealousy (Rom 11:14), Jehovah addresses the exiled ten tribes of Israel with a loving invitation.
cause ... anger to fall - literally, “I will not let fall My countenance” (compare Gen 4:5, Gen 4:6; Job 29:3), that is, I will not continue to frown on you.
keep - “anger” is to be supplied (see on Jer 3:5).