For difficult to release entities, hypnosis with a therapist trained in Spirit Releasement can be very effective.
The link below will lead you to a list of practitioners trained in QHHT, created by the late Dolores Cannon. Look for those who specialize in spirit releasement.
Reiki Master, Evolutionary Life Coach, Removal of Dark Entities and Implants, Light Language Specialist, Shadow Work Connections to Higher Self, Angelic and Galactic Energies