If you're in the Apple ecosystem, please set up a recovery key so that your loved ones can access your photos and other things in case something unexpected should happen:
* https://support.apple.com/en-ca/109345
More generally: open Notepad (or whatever) and put the URL, username, and password for e-mail† account and bank/credit card accounts (and phone PIN), print it out, and put the paper in a sealed envelope and show its location (on top of fridge?) to a trusted friend/family.
† If someone can access your e-mail / SMS, they can probably reset any other account(s).