Yes, 100%! This is actually exactly what people recommend. (Technically you should really just use a password manager and generate really long passwords for everything. But the password for the *password manager* should be a passphrase.)
I highly recommend looking into diceware password generation. Basically, get a long list of words, and get some (real-life) dice. Rolling the dice picks one of the words from the list. Rinse and repeat as many times as you like.
Then, I would recommend substituting some of the characters, just to ensure that cracking it won’t be as simple as a dictionary attack.
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