You know what’s even better? Go to http://passwordsgenerator.net/, generate as many N-digit passwords as you want and store them in a password manager that’s reasonably sane (that way you can use a very large N). Google, Apple or Microsoft are going to be good ones because they already control your operating system and browser. There’s also a few other popular ones that may offer slightly more features/better organization if that’s important. Also turn on real 2fa (app or even better a U2F key).

No, this won’t really protect you from a very determined attacker. Then again, neither will using a password of three random words. The endless debates about the best password policy are counterproductive. At the point it matters, you haven’t designed your security robustly enough.