Here is an article discussing it.

I would personally think that Buddhist techniques like mindfulness and meditation would be helpful here.

I don’t know how I really achieved it, but one thing I do remember I did was altering my negative self-talk so I would be alarmed and notice I was doing it.

I basically changed “I should kill myself” to “I should kill (some other specific person)”, as the latter horrified me. Might be a similar technique.