just my opinion, not in any way qualified to answer really, but id recommend studying neurodevelopmental disorders. My reasoning for this is because i have heard that theres a huge problem within mental health type services for counselling if you have a neurodevelopmental condition. Those types of conditions often cause people to develop mental health problems during their teenage years or later in life (as they can cause isolation and low self esteem due to societal expectations) and can mean a different approach is needed in psychotherapy for those individuals because they are less likely to be able to respond to traditional therapy. Hope that helps 🙂