If you want to help prevent suicide, rather than limiting methods and consigning many people to continued torment and suffering, how about advocate for improving some of the societal problems that contribute to people losing all hope?
Poverty is a huge driver, along with inadequate physical and mental healthcare. Homelessness, or being faced with it, is demoralizing and inspires hopelessness. Some of the hardest-to-remedy but most hard-hitting issues are always going to be domestic physical, sexual and emotional abuse and bullying.
How about we try to improve other peoples lives and quality-of-life rather than sealing off the exits and trapping them in it? If we are ever going to have a truly compassionate society we need legalized assisted euthanasia, available to everyone after a waiting period, confidential counseling and a finite period of treatment. We all need to be honest with ourselves, stop the judgements, and provide the same options that we would want available if we were in somebody else's shoes.