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I know password managers exist, but they don't solve the "what accounts do I even have?" problem

I keep a list in a simple text file that is encrypted and hidden by appending it to a particular .jpg image file (of which I have thousands). For convenience, I have a little CLI utility I wrote which accepts a filename and key in order to automate retrieval, decryption, viewing/editing, re-encryption and replacing the data in it's hiding place --- all without altering the carrier file's date/time.

I have retrieval instructions in a sealed envelope with my lawyer and a trusted family member --- only to be opened upon my demise.

I keep backups of this along with all my personal and business documents, will, etc.. Basically, I follow the 3-2-1 backup plan (https://www.backblaze.com/blog/the-3-2-1-backup-strategy/).

I carry the "1" part strapped to my wrist at all times (encrypted with Bitlocker) so it is as safe as I am --- if not safer.

https://www.thingiverse.com/thing:6784665

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Open file and search backwards from end looking for marker bytes. If found, save the file date/time then extract the data and decrypt using AES. If the decrypted data passes a checksum test, place the data in a temporary file and load the file into a text editor. Wait for the test editor to exit. If the file has been changed, retrieve the data from disk, re-encrypt, place it back in it's hiding spot and restore the carrier file's original data/time. Lastly, overwrite the temporary file with random data before finally deleting and exit.