If the above doesn't work, check the Files app for anything you don't want/need.
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Clear Document & Data
Tap Settings > General > iPhone Storage
Tap an app that didn’t come with iOS.
Check Documents & Data for each App.
You can “Delete App” in red letters, if you wish.
Please read what is written underneath the Delete button before deleting the App.
Re-download the app from App store.
How to delete Safari documents and data?