Well depends on what the objective is, my dad was kinda like me in that he always said to my mom "Yea, if things got bad I would just *bam*, yknow?"
He was a labourer, then turned into working in hospitals and stuff, always did a bunch of drugs and alcohol.
So if you want a lifestyle where you do rewarding work while destroying your body I'd recommend that. And labourers are fucked up, so you get access to like substances and stuff, not advocating for you to do that ofc, just telling the experience of seeing my dad's life.
Then if you just want an excuse to like... Have an "accident" you have a ton of careers for that, operating heavy machinery or working at a factory.
When I was working in a factory and feeling extremely bad, my dad had cancer at the time and I was really depressed, I thought how easy it would be to pump up the pressure of one of the machines in the factory to the max, disable the safety with a cardboard trick I learned and just put my head inside that, compressing it in like 5-6 seconds into mush.
But then again, I don't understand the nature of the question. The old guys in the factory had a few missed fingers or sometimes a hand.
I heard a story of a kid working construction that fell and got impaled and died, so that can happen too. Ummm, what else, anything with hazardous chemicals or like soldering, that ruins your health too. Just like if you don't wear protection at all.
Hmmm, what else.... Well, any type of driving a vehicle, although that may end up causing harm to third parties by mistake.
Drug dealing and police work
Hmmmm, prostitution, depending on the clients can become dangerous...