That's what password managers are for. Just remember the password for the manager, plus maybe one or two critical accounts (e.g. email) and you're good to go. Let the manager deal with the complexity of generating and remembering random passwords.

I don't understand this response? A passphrase is easier to remember than a password. 50 passphrases may not be easy to remember, but they're easier than 50 passwords.

Use a password manager.

I use a similar approach and have around 8 of such passwords memorized. The rest are in my password manager.