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Why You Need a Digital ‘Dead Man’s Switch’
(lifehacker.com)
This is a most excellent place for technology news and articles.
It's called a sheet of paper with important information on it.
No need for anything fancy or some weird online thing, just stuff written down.
My strategy too. I have a piece of paper with my bitwarden credentials (password and OTP code) and a list of important items like bank accounts, utilities on autopay, etc.
I review it with my spouse every year and update anything out of date.