True.
Act 4 of Macbeth indeed focuses on Macbeth further establishing his tyrannical power through violent actions. He seeks out the witches again, who present him with three key prophecies that contribute to his overconfidence. Macbeth's orders to murder Macduff's family demonstrate his ruthless nature, and Macduff's reaction to the news of this slaughter intensifies the emotional stakes as he seeks revenge. The act concludes with the groundwork laid for the impending confrontation between Macbeth and Macduff, highlighting both Macbeth's misguided confidence and Macduff's desire for vengeance.