Its possible to kill yourself with a shoelace
If your able to tie it against the wall or maybe even have an anchor point as well as have shoelaces long enough you can let your own body weight do the job, it called "short drop hanging".
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WHAT NO TF
You can also slit your throat or a certain vein which can cause slow death, you can also make yourself choke on food, stabbing yourself which is already heard about a lot, can even suffocate yourself or overdose on a pill that can kill you sijk
yuh
you can jump from building which is also heard about a lot, eat toxic life-threatening things, get bit by something that can kill you on purpose, and pay someone to kill you
yah
you can also eat glass which can slit your insides and can cause a spreading infection which kills your organs, poison yourself, and also drug yourself to death