My iCloud is full. Every once in a while my iPhone nags me to upgrade for a few days in a row and I tell it no and it goes away for 6 months or so. My Mac has

My iCloud is full. Every once in a while my iPhone nags me to upgrade for a few days in a row and I tell it no and it goes away for 6 months or so. My Mac has never once nagged me about iCloud storage.