Not sure if it counts as spiritual, but for 10 years I've consistently done subconscious, mind+body healing exercises. It's been profoundly transformative.
Prior to that (and for quite a while after) I had a huge amount of drama and chaos in my life, and after searching far and wide for answers (starting with the usual stuff - mainstream therapy, meditation, etc) I learned about these healing practices, which address the physiological reactions that happens when we experience triggering events.
Over time, my practice has developed into this: try to live a normal, well-functioning life, do my best at whatever I do. When things happen that trigger reactions - anger, resentment, arrogance, jealousy, contempt, shame, etc, or anything that makes me feel a jolt or even very mild visceral reaction, undertake the practice, which enables me to find where in my past the reaction comes from, then do a brief breathing exercise to let it go. Rinse and repeat. Over time, the reactions weaken, my overall stress burden diminishes (along with physiological issues like inflammation, chronic pain, etc), and bit by bit life gets simpler and important indicators like relationships and career steadily imrove.
It's hard to recommend stuff here (I've been trying for years to work out how to reply to this answer FWIW), as a lot of the popular books about it are too close to law-of-attraction, Tony Robbins, Think and Grow Rich kind of stuff, or linked to the chiropractic field, which is a turnoff for a lot of for most people here, for reasons I understand, as I don't subscribe to much of that myself.
I also don't want to recommend particular practices here, lest I be seen as making health recommendations, which I'm not qualified to do.
I've written a lot of content about my own journey, which can help people to know what different practices are available and enable people to decide for themselves what practices are worth trying. Anyone is welcome to email me (address in bio) if they want to read what I've written. I also have a Discord group for people who want to discuss this stuff with other folks who are interested (pretty much everyone in the group is from HN).
But if you just want publicly available info and modalities, try these:
Authors: Gabor Maté, Peter Levine, Bruce Lipton, Bradley Nelson, Stan & Christina Grof.
Modalities: NET, Psych-K, Somatic Experiencing, Holotropic Breathwork, EFT/Tapping, Family Constellations, Ericksonian Hypnotherapy (but not NLP, in my opinion).
Bessel van der Kolk's book The Body Keeps the Score is a brilliant and enlightening study of how trauma and all kinds of negative experiences are literally stored in the body as tension, which, when chronic, can become debilitating inflammation and pain.
Van der Kolk noted in his decades of practice that trauma victims, and those who are chronically angry, anxious, wary, etc. are deeply out of touch with their bodies. They were often clumsy and visibly tense, though when asked how their bodies felt, they either couldn't say, or they were just "normal."
He had to first get patients to recognize how their bodies felt, then taught them to relax and change those feelings through various exercises, meditations and practices. When the body started to loosen up, the mind and emotions followed.
Edit Eger, a holocaust survivor turned therapist, found the same things in her decades of practice. Both books spend a lot of time describing the symptoms and problems, and the address healing practices toward the end.
Prior to that (and for quite a while after) I had a huge amount of drama and chaos in my life, and after searching far and wide for answers (starting with the usual stuff - mainstream therapy, meditation, etc) I learned about these healing practices, which address the physiological reactions that happens when we experience triggering events.
Over time, my practice has developed into this: try to live a normal, well-functioning life, do my best at whatever I do. When things happen that trigger reactions - anger, resentment, arrogance, jealousy, contempt, shame, etc, or anything that makes me feel a jolt or even very mild visceral reaction, undertake the practice, which enables me to find where in my past the reaction comes from, then do a brief breathing exercise to let it go. Rinse and repeat. Over time, the reactions weaken, my overall stress burden diminishes (along with physiological issues like inflammation, chronic pain, etc), and bit by bit life gets simpler and important indicators like relationships and career steadily imrove.