Seriously, reset your email password to something you can never remember and write it down and have someone hold it for a month (don’t tell them what is it, tuck it in an envelope). Let your mind run circles around your fears and you’ll find out how little that email account owns you.
Freezing one credit card will shut off all your frivolous subscriptions (Spotify, Netflix, Prime).
You’ll call your internet provider because you don’t want that cut off.
You’ll call your bank, brokerage.
You’ll remember your bosses contact info, and the one person at work you trust.
You’ll let the most important people know (could be as few as one) that you’re off the grid, in your terms. You’ll memorize their number.
You’ll realize all the people you could care less about, or they about you, if neither of you ever heard from each other again.
Kind of a freeing thing. Then you’ll make a new email, and you’ll never add that much cruft to it ever again.