I have had other successes with LSD as well. I assume it is related to mindfulness helping break thought-spirals. Show the brain a way out of the spiral, and it can rewire the escape for future use. LSD increases neuroplasticity: the propensity of the brain to rewire itself. Which is probably why LSD is also incredibly risky.
Related, in 2012 a meta-analysis concluded it helped alcohlics
> a single dose of LSD, in the context of various alcoholism treatment programs, is associated with a decrease in alcohol misuse
https://journals.sagepub.com/doi/10.1177/0269881112439253