I actually did a presentation during highschool about suicidal rates in my country and i covered some of the common methods used.
drug cocktail is one of the worst options out there, low chance to actually work and high chances to fuck you up, no wonder thats one of the most common method among foids along with stabbing.
Suicide completers tend to use more lethal methods, like shooting themselves or hanging. That's why suicide is more effective among men, we actually have balls while foids are fucking cowards.
If you really want to do this then buy a gun, if you can't cause of pussy regulations from your government, then the rope it is, the rope knot however need to be carefully prepared, if you do a poor job then you will have a painful and long death, and in some cases you actually have a slight chance of surviving. Jumping from high places is a common method too, but it needs to be very high and i think it hurts like hell. Pesticide is another one, but i guess it must hurt a lot as well.
I tried to kill myself too, by jumping from a high place, spend the whole night smoking cigarettes, drinking and thinking. I gave up as you can see, i just couldn't do it, roping is not easy.
i'd say to find a cope to live, and by that i mean doing something you enjoy, like watching movies, playing games or doing drugs, that's my cope tbh.