You can free up space in your Apple iCloud account be deleting app data using these steps.
- From the Home screen, open “Settings“.
- Choose “iCloud“
- Select “Storage“.
- Select “Manage Storage”
- Select your device.
- Scroll down and select “Show All Apps“.
- Turn the app on or off as desired.
- Tap “Turn Off & Delete” when prompted, and you’re done.