Getting a book on DBT and Workbook may help in this area. If your new T has the same textbook one can compare results. Most I believe are doing therapy online during this period of time. Most therapists know of BPD but few really know how to treat it; that’s crucial in finding the right T. Otherwise one goes from pillar to post back and forth with therapist which for most with BPD is extremely upsetting. Look for one who specifically addresses BPD and has a solid foundation of experience. Otherwise, one will spend many years and tears with frustration. I hope you do find the best therapist to meet your needs.