When I created my Gmail account in the 2000s, I didn't think I would ever fill up my inbox. That seemed especially true after Google increased the amount of free Gmail storage to 15GB in 2013. But ...
If you don't have enough iCloud storage, it's easier to upgrade your cloud than get a new phone. In the US, you can upgrade to 50GB for only a dollar a month, or you can go bigger: 200GB for $3 a ...