ISB ~ Revelation 9 v20

did not repent:The survivors of the sixth trumpet remain hardened in their wickedness (16:9, 11) despite the merciful purpose of these judgments to discipline sinners and bring them back to God (Lev 26:14-33).

worshiping demons and idols:The Bible equates idolatry with service to fallen spirits (Deut 32:16-17; Ps 106:36-37). Taunts against idols as lifeless and motionless images were proverbial (Ps 115:4-7; Dan 5:23; Hab 2:18-19).