How can I hurt them the most? (Revenge)

I’ve been dealing with narcissistic / borderline parents my whole life. I’ve moved away, I’m in therapy, and I’ve reduced contact as much as I can… but somehow they still have this weird grip on me :(

Lately I’ve caught myself thinking about how I could hurt them the most (of course emotionally, not physically!!!). I’m not proud of it, but it’s there. Is there even a way to hurt people like that emotionally? I’m so tired of being the one who suffered and now has to do all the healing.