I’d say it’s ok. Credit Card are already inherently unsafe and regardless the bank has you covered in any case of fraud. So no need to worry about putting it on a password manager. Also, credit cards are something you probably change once a year or so when they deteriorate, so you can get in the happy of ordering a new one every now and then. It’s great to also keep track of forgotten subscriptions when you get the “your payment failed” email.

On the other hard you could something more private and secure than the well know ones like 1password and last pass, been hacked before. You could use Bitwarden that’s open source and great reputation among the privacy community. No need to give them any data. Plus you can choose a storm password and enable 2FA. For 2FA you can also use something open source and locally hosted like Aegis. Please delete Google authenticator if you are using it.

Bitwarden + locally hosted 2FA is pretty hard to hack even if user data is leaked. If you want even more security, you can use a yubikey and have your 2FA offline.

I’d honestly worry more about my nsec than my credit card 😂😂