Fentanyl overdose. Fentanyl is extremely cheap (hence why product is so frequently cut with it) and lethal at absurdly low quantity, hence that there are so many deaths from product cut with it. However, I have no real-life substance contacts (even a run-of-the-mill weed guy could probably refer me to one, or a user in the same scene) and a DN setup with secure OS, PHP, and Monero is too complicated for me. Not too much so as to be feasible, but too much of an entrance barrier especially for an impulse decision like suicide which most of the time I instinctively push away. Injection is also easily botched if you are not a frequent user or a medical professional, and that is all the more true when your body is struggling against your mind. Users are not trying to CTB with the stuff, so they are also not panicking when injecting.
Meanwhile I've found more accessible methods on here (hanging, SN) and I'll probably be using one of those very soon.