Years ago, a stroke patient was thought to be without much hope. Today, we know that the brain is very plastic and adaptable.
Rehabilitation is done on stroke patients to regain the losses they suffered.
We now know that although part of the brain died, another part of the brain can take over that job. You are literally retraining the brain.
It is the same with overcoming Adverse Childhood Experiences, regardless of your upbringing, you can retrain your brain and rest your nervous system.