You can still accidentally leak your password via phishing or malware. 2FA is fine if you don’t tie it to a phone number, simplest way: install any authenticator app for TOTP tokens. Scan the QR code on multiple devices like phone + tablet, or old phone, for redundancy. Or save the secret key.

Google and most critical services also give you a list of 10 single use emergency codes that you should print or save in Keepass - lost the phone? Nbd just use one of the codes and reset 2FA.

I also never thought my non shared password would be public but one day I suddenly got prompted on the authenticator if I wanted to login; still no idea how or why but at least no one could get in and immediately rotated out the password.