The topic of a “living will” came up in a family discussion after my mother’s funeral. None of us have a pathological desire to live at all costs, but as it turns out, figuring out when to say “yeah I’m done, see yah” and halt treatment is way more complex than it first seems, especially when making the decision for someone else. Things can happen very fast, and there’s a bunch of things that basically require a job…
https://www.orderofthegooddeath.com/
They also do a lot of advocacy around green burial, alkaline hydrolysis, and whatnot as well.
Caitlin Doughty (who founded the Order of the Good Death) Ask a Mortician channel on youtube covers this stuff too, but the older videos might be out of date.