As an Apple user, you can get 5GB of free space at the beginning you set up iCloud. But the amount of iCloud storage that you are given for free is generally more than adequate for most users. You may get these emails from Apple saying
Your iCloud storage is almost full. You have XX MB remaining of XX GB total storage or same message like
Your iCloud storage is full.
Basically you have two options: The first option is that you can purchase additional storage from Apple. For instance, in the USA, Apple offers: 50GB: $0.99; 200GB: $2.99; 2TB: $9.99. The other option is that you can
free up iCloud storage to release more space.
This article will give you 3 methods to
free up iCloud storage on iPhone XR/XS Max/XS/X/8 Plus/8/7/7Plus/SE/6s/6/5s/5. [panfone.com]