Whether you believe in past lives or not, past life therapy is an effective modality for clearing the "unexplainable".

For example, we regularly get triggered into feeling betrayed, but nothing in our childhood rings the bell of betrayal. Abandonment, rejection - maybe, but not betrayal. It's entirely possible that this moment of betrayal was so trivial that we cannot identify it, or even when we do, the trigger persists. This happened to many of my clients, and myself. I'll share an example later.

This is when a past life therapy could work wonderfully. Whether it works through our imagination or it is indeed our soul'd memory, "remembering" the "original sin", i.e. a situation when we felt deeply betrayed - in another time and setting - heals the trigger.
The example: a client was struggling to "be herself". She had inexplainable fear of showing up authentically for herself. E.g. expressing her views, her likes and dislikes.
When we started her session, we went into her childhood and she's remembered that her grandma overheard her and her little sister play "adult" house with their dolls. They got scolded, but there was no "trauma" - the child was not "terrified" or "devastated", i.e. nothing enough to cause such a persistent fear of being herself. So, I make a decision to regress her into a past life...

Sure enough, she sees herself as a teenager participate in a pagan new moon fire ceremony with her mom and grandma in a catholic Rome sometime in medieval times. They get discovered, both her mom and grandma get burned on the stake for witchcraft, her teenager self watches two of her closest people die for who they are. Bingo.

In past life therapy we do the same process as in the inner child healing, the "soul retrieval". We sooth the shock, the terror and the devastation that kid had lived through, review the soul lessons, shift perspective, i.e. "this make me stronger by..." or "these women showed me that being authentic is the biggest gift of all", and "bring the soul" of that teenager back into the psyche.

Past life therapy is like watching a period drama and being the main character at the same time, because you feel all the emotions that the persona you see yourself as feels. It's a super fun and healing process. I used to be obsessed with past lives. I saw more than a hundred of my own.

I healed a bunch of phobias and digestion conditions. Like I was afraid of darkness, insects, caterpillars and half of the animal world. I had indigestion and couldn't eat gluten, dairy, meat - pretty much everything made me bloated. It sounds crazy but it worked. That and ayahuasca lol.