Within another person's Mental World, even Professor X, who was proficient in psychic power, could only use his own strength to gradually guide a certain force or personality deep within their mind, continuously strengthening it until it grew strong enough to take control of the body and suppress the undesirable side.
Of course, there was another method. If the other party offered no resistance, then as a Mind Master, he could also block off one side of their personality.
But in Wanda's world, he would most likely be unable to restore Wanda's kind side to normal. Her current obsessive personality had reached an utterly unreasonable level. Unless she came to her senses in time, guidance and soothing through psychic power could only provide a very brief stopgap measure. At most, it might make Wanda hesitate for a moment, but perhaps in the next instant, she would cast that hesitation aside and revert to the obsessive Scarlet Witch who would stop at nothing to achieve her goals.
The Scarlet Witch's condition was so troublesome that few were willing to face it head-on. Merely fighting her was enough to leave one dizzy and overwhelmed. After all, if they could truly stand against her, Strange would not have needed to flee across universes with a girl, would he? Those Sorcerer Supreme Stranges who had died at the Scarlet Witch's hands were all reminding Strange that his own death was near.
This universe's Stephen Strange could fight the Scarlet Witch, but as he himself had said, if there was a better person for the job, why make things difficult for himself? Coming here to keep the space stable and prevent their battle from affecting reality, serving properly as a support tool, was already him doing his duty.
Stephen had long since been worn down