To regain saved passwords from your iCloud Keychain after resetting your password, you must:

To regain saved passwords from your iCloud Keychain after resetting your password, reauthenticating to your iCloud account is necessary. When you reset your device's local password, your iCloud Keychain may become inaccessible until you prove your identity by signing back into iCloud. This process ensures that only you can access your sensitive information, including passwords.

Successfully reauthenticating allows your device to synchronize with iCloud, restoring access to your stored passwords. You may be prompted to enter your Apple ID credentials or verification codes, depending on your security settings.

The other choices do not provide the correct solution. Rebooting the local account may refresh the system but won't help in accessing the Keychain data itself. Contacting Apple Support can be a useful step in certain situations, but it's not typically necessary for regaining access after a password reset; reauthentication generally suffices. Resetting iCloud settings might lead to losing other important data and preferences without addressing the password retrieval.