3-2-1 Rule dictates 3 copies across 2 types of media (usually referring to disk and tape, but that’s not very applicable to writing) with 1 kept off-site. I suppose you could treat a photo of the written password sitting on a digital picture frame to be at least as unhackable as a notebook…
Keepass is great for similar reasons but moreso because you can keep everything local and offline if you want. It has a built-in mechanism for synchronizing databases plus a way to point it at a completely arbitrary URL for you to host a single database yourself and receive updates. It also supports multiple potentially interchangeable authentication methods like physical tokens, passwords, biometrics, and keyfiles.
Cruelty Squad and Psycho Patrol R (both by Ville Kallio) were also made in Godot, for those who enjoy it when the dev is on drugs throughout development and working solo. Just know that the games are rough in the sense that the developer is on record stating that actual spite towards the player went into the game.
Proper password managers truly are superior