Tips to help my narcissist father?

Hello everyone. I'm writing this post to see if you have similar experiences or perhaps some tips to help my narcissist dad become a better person?

I hate labels, but for the sake of making the story short:

• My dad is an abusive narcissist (probably because of all the trauma caused by his own mother)

• My mother died recently of a neuroendocrine cancer, probably caused by the extreme amont of stress that my father caused

• I'm the "awakened empath" son who finally got over his family traumas

I confronted my dad yesterday to inform him that I do not want him in my life because of everything he did. However, I was (positively) shocked by his behaviour. After I accused him of all the abuse, cheating, manipulations, etc.. he had the typical narcissist reactions - anger, denial, and accusing me of being crazy. He even ran away like a child to the garage. But after I followed him, he actually calmed down and acknowledged a lot of the bad things he did. We even drank a beer together, talked a bit more, and then I went home.

It gave me hope that I could actually help my narcissist dad to change. I don't expect his narcissism to be healed, but if people around him suffer less then I'm fine with it. After my mom passed away, he started seeing a therapist. I know that he keeps lying to the therapist and is not telling all the truth. But with the current situation (especially if he accepts that I participate to his therapy sessions), I think that there is a decent chance to help him become a better person.

Do you guys think that there is a slight chance or am I just delusional/naive? Perhaps do you have similar experiences or some tips to help him?