I have not used NextAuth, so take my analysis with caution. As far as I can tell, NextAuth is similar to Passport.js as it offers many adapters to sign in with different providers (e.g. Twitch or Pipedrive). It is not an identity system though, so it does not have things like "update your profile info" or "link Google to this account". I think this manifests with missing password authentication. Even though that's no longer en-vogue and lots of marketing $$$ go into start ups promoting that passwords are bad, "something you know" (vs something you have, something you are) is still and always will be an important security factor in authentication that will most likely never go away.
If you do want to store users locally, you have some adapters you can use. They leave a lot of room for interpretation (or rather implementation), meaning that you will probably have to implement a lot of stuff from zero!
Ory Kratos is like the system behind the Google, Twitch, or Pipedrive profile management, so it has the database of users and it offers variety of user flows for e.g. updating sensitive information, adding WebAuthn 2FA, managing one's profile, and so on.
To conclude, you most likely will be able to combine NextAuth with Ory Kratos or Ory Hydra if it makes sense for your use case!
If you do want to store users locally, you have some adapters you can use. They leave a lot of room for interpretation (or rather implementation), meaning that you will probably have to implement a lot of stuff from zero!
Ory Kratos is like the system behind the Google, Twitch, or Pipedrive profile management, so it has the database of users and it offers variety of user flows for e.g. updating sensitive information, adding WebAuthn 2FA, managing one's profile, and so on.
To conclude, you most likely will be able to combine NextAuth with Ory Kratos or Ory Hydra if it makes sense for your use case!