I tried long memorable passphrases for a time, but a few of my passphrases were not as memorable as I expected and I ended up having to reset several of them. Eventually I got fed up with it and switched to an offline FOSS password manager and use generated passwords from that. To unlock the password manager, I use a single long passphrase that I am confident I can remember. Now I worry that I'm putting all my eggs in one basket, but at least my passwords won't be guessed or forgotten.