Crappy Childhood Fairy on YouTube
YouTuber and author, Anna Runkle teaches people to recognize and heal the symptoms of Complex PTSD (CPTSD). While this channel is not explicitly about Cassandra Syndrome, it has helped many Cassandras work through compounding issues related to their relationship trauma.
Anna’s website, crappychildhoodfairy.com, has more info on courses, community and her book.