This is gonna sound kinda weird but hear me out and try to consider it from a practical angle:
Sexual arousal.
While I have been able to use extremes of emotion like anger or sadness or grief in reducing my urge to eat/drink and increasing my urge to engage in very risky behaviours like in my case severe self harm, those behaviours are not as directly lethal as strangulation.
The part that makes it kinda shameful to discuss is that I discovered this ability through the normal experience of sexual experimentation and I was raised in a puritan part of North America so y'know it's just a can of worms. But credentials aside lol if a person is sexually aroused that opens the mind to a whole host of shocking and otherwise bizarre or abnormal behaviours including the willful pursuit of oxygen deprivation through ligature strangulation, and because of the plastic nature of sexual behaviour it really doesn't take long to go from "hey that did feel a little nice" to "no thoughts because I've successfully strangled myself to death"
Once I train myself past the shame of any family possibly thinking I masturbated in my life, I really think fondly of it as a psychologically painless way to go. Just y'know. Gotta die a wanker
I've been considering paying a CBT-therapist to give me tools to get over my death anxiety, since anxiety is basically what SI is. Unclear if it would help that much, or even at all but anxiety is as natural as SI so having tools to combat one technically could help with the other.
I experienced recently some English translations of the Bardo Thodol (The Tibetan Book of the Dead) in a very reflective composition on YouTube called Songs From the Bardo, and I found it to be incredibly reassuring. Now I am curious to hear the entirety of the Bardo Thodol it it's possible. This is directly intended to help cope with end of life anxieties, so, you may also be interested.