Personally, I think that the key is to be interested in new things.
I will be recruiting the demented to mine Bitcoin manually/organically. If I get enough of them, and there are millions upon millions doing not very much, then I believe I can outgun Bitmain and maybe even bring a few of them back from oblivion.
As for what I go from, something respiratory is my nightmare. The idea of slowly suffocating is horrible.
Either way I'll be straight off to Switzerland to be put down at the first sign of anything that looks like a one way trip. If I get an itchy finger I have to talk myself out of slicing it off so there's no way my body is going to make me suffer for long. I'll get it before it gets me.
No need to go to switzerland. Any cold weather (below 0 celsius) will do, get some booze and freeze till nil. Preferred suicide method, because it introduces the least amount of pain. A friend of mine went to the mountain woods two years ago, they didn't even find him to date.
Disclaimer: This is just information, no instructions.