i cloud space
I keep getting notifications that I will run out of storage but I just bought a new 64 gb 8 plus and know I have plenty of storage. Why do I continue to get these messages?
iPhone 8 Plus, iOS 12
The notifications are probably about your iCloud storage space, not the space on your phone.
One possibility is that you have iCloud backups from your old phone that you may no longer need. See the following for that and other potential items: Manage your iCloud storage - Apple Support