The best we can hope for is that his small inner circle of people he actually listens to can be convinced to convince him to step down. Which looks to be happening maybe.
I've seen it suggested that probably the best way of doing that would be flattering his ego about his accomplishments and giving him a narrative he can follow that makes him feel like a victor as he leaves. "Good job, you defeated Trump like you said you would and carried the party through a difficult time!" That kind of bullshit. He's a racist mass murderer and needs to go obviously, but I think his belief about his legacy is maybe one of his weak points that should be leveraged.