When we talk about the autonomy of suicide, it's almost always discussed from the side of the right to die — which is definitely important and does need to be accepted by more of society. But there's also the side of the right to live. Until society stops punishing people for their existence and depriving them of what they need, the autonomy of suicide for everyone cannot be reached. Because when people are killing themselves because of changeable, societal structures, that is not a completely autonomous decision. It is one that has been forced upon them.
Suicidal people will always exist and people who will always be suicidal exist and that is not inherently an issue that needs to be solved. But it becomes an issue when people are forced into it. Currently, suicide prevention involves institutionalizing suicidal people, telling them that they must survive, by any means possible, but so many of them have been told the opposite for their entire lives, implicitly or otherwise. Suicide prevention should involve working to improve society, making it a livable and survivable place for all people. Only then will the autonomy of suicide be achieved. Otherwise, so much of it is social murder.
In short, "Don't kill yourself 🥺" isn't enough — solving the why behind it is.