Possibly two ways, if you have both Android and iOS devices and you register both? (I assume Android and iOS remain independent.)
A password is in your head. If you lose that, there's not much use for the said password. But otherwise, it's secure. And it's pretty secure from an infosec perspective if it's a passphrase.
There's no perfect solution. Having a printout of backup codes in a fireproof safe is pretty good, but it's of no use while traveling. A Yubikey is good, but it might not work (wrong USB port) and it's a device that could break.
Having multiple ways to log in reduces your risk of lockout, but also makes it more likely that someone unauthorized could get access.
- There-are-three-ducklings3-in-the-lake
- There-are-five-swans5-in-the-lake
- There-are-six-hedgehogs6-in-the-bush
And so on. You only need to remember the latest number and animal, but the entropy of the whole string is much higher unless someone also knows your personal password structure (which is kind of like a second factor).
With a password manager, you only need to remember that one passphrase. If you have to enter it daily, I think it’s very difficult to forget.
You can access your passwords mostly independently from any device and it’s probably about as secure if good generated password hygiene on websites and services is used.
I’m not sure this is better than using a device to log in.