If you're talking real trauma, I'd seek out a therapist licensed in EMD or EMDR. Data shows it's faster and more transformative that Cognitive Behavioral Therapy. It seems to work well for critical past events (rape, driving accident, etc). Sub-clinical trauma (like that often experienced by police officers) seems to respond if the event can be crystallized.
If you're talking about the trauma of something that isn't to that scale, say the trauma of being dissatisfied with how life is turning out, consider meditation.
[1] https://www.goodreads.com/book/show/33413909-the-deepest-wel...