How to Free up iCloud Storage Space

There are two ways can help you solve "Not Enough Storage" in your iPhone iCloud.
If you have enough money, you can buy more storage for your iCloud.
Step 1. Open the "Settings" app on one of your iOS devices and tap "iCloud".
Step 2. Scroll down and tap "Storage & Backup".
Step 3. Select "Change Storage Plan".
Step 4. You can buy more storage as you like.

Trim the app fat
Step 1.Go to Settings – iCloud - Storage & Backup – Manage Storage
Step 2. You should see a list of apps displayed with the space each uses up. Choose the device you want to manage.
Step 3.Once inside, you can TURN OFF the switch against the apps that you don’t want to backup.

Both the two ways can help you get out of the problem. And if you have any questions, you can leave your messages.