Clear “other” data
How do I go about clearing out the “other” data on my iPhone 6s Plus running iOS 14.3? Can it even be done?
iPhone 6s Plus
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At the top of that list.. is there something shown for iCloud that's hung at 1%?
If so, try connecting to WiFi, plugging in your phone and letting it sit locked overnight to see if it resolves itself.
You can contact Apple to see if they can help troubleshoot Get Support
Or you can try this route:
backup your device, restore to factory settings and the restore from your backup
How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod to factory settings - Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support