The maximum number of free accounts have been activated on this iPhone.
The maximum number of free accounts have been activated on on my iPhone how can I fix it’s and log in another account on my iphone
iPhone 11, iOS 17
You can't fix it because nothing is broken. This is a limitation you cannot side-step.
Read Apple's explanation of this situation in If you see "The maximum number of free accounts have been activated" - Apple Support in which several alternatives regarding creating new Apple Accounts are suggested.