How do you deal with emotionally immature parents in Islam? Their behavior can be so damaging to one's health (mental, physical, emotional) and life (finances, opportunities, career).

I'm trying my absolute best, but nothing seems to be working. I've tried cutting contact (before realizing it might be akin to cutting ties and therefore haram, so no, may God forgive me), putting up boundaries, using a respectful but firm tone, the emotional distance, gray rocking, you name it. No success so far. I would really appreciate any help, advice, testimonies from people who have been through this and come out of it with good, sane, healthy relationships with their parents.