Like @COWolfe said, they don’t change unless it hurts
My father was or is a narc, he only started being a good father after my mom divorced him ande and my little brother stopped talking to him
Only then, when he lost everything he started to change, i don’t even know if the change is real or only an act
Actually, he still not a ‘good’ father, just less worst than he was, he doesn’t hurt us anymore but we also are no living with him so we can’t really say
Even after they divorced he refused to work on himself “there is nothing wrong with me, you are the one who needs therapy” because it was always the fault of everyone else and never his