Worth mentioning DBT is a subset of CBT, not a synonym.

https://www.skylandtrail.org/4-differences-between-cbt-and-d...

DBT originally stems from therapies for Borderline Personality Disorder. While it has applications beyond that for things like anxiety and bipolar management, it may or may not be the right answer for people who don't struggle with negative impulses or behaviors.

I'd probably start with sources on more general CBT for someone just needing a nudge or who is more depressive than impulsive.