Trauma from past or current life can fragment a soul. The person may feel like there's something missing. There can be intense sadness which holds a person back. A shaman can journey with this person in an altered state to perform a soul retrieval. The person essentially re-experiences the trauma and associated feelings, and the soul mends.
However, trauma can also create defense mechanisms which also leave a person with similar feelings, and a dead weight inside that holds them back. In this case, a person commits a symbolic suicide which gives that aspect of themself to Death so they can heal and grow, like cutting off a dead part of a plant so it can sprout.
How can you be sure what to do? What if it can't be mended or if that aspect is given up, it just leaves a void in the soul?