Trying to create my icould but responding The maximum number of free accounts have been activated on this iPhone, what's the solution?

Maximum limit for creating Apple ID from the hardware address of iphone is three , you can't create more Apple ID accounts , however again sign in with your same Apple ID and it's account credentials ( in fact you have to sign out the Apple ID ) in the empty fields or sign in with another apple id that was created from another Mac / iPad or different iPhone .

See the article Sign in with your Apple ID - Apple Support