Always plant your mint in a pot. Preferably a suspended one.

Proper password managers truly are superior

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.

As the experts say: “Use it or lose it.”