There are past life hypnotherapists. Since trying on your own makes it difficult to stay in that subconscious place, you might want to seek out a professional.
I have been watching some you tubes on this very subject lately, and there is a past life hypnosis therapy that is taught that seems to be very therapeudic, called QHHT (Quantum Healing Hypnosis Therapy).
Here is thier website, where you could find a practitioner.
https://www.qhhtofficial.com/
There are videos on you tube that show some of these sessions.
I remember Sylvia Browne also recommended past life regression for healing this life. She wrote a book about it, I think the title was Past Life Future Healing or something of that sort.
A fascinating thing she found when she took people through the past life that was giving them so much problems in this life, she realized that birthmarks were past life traumas showing up on our physical bodies from cell memory of these past lives.
An interesting topic to be sure.