Delete unused apps
Offload unused apps
Remove large photos and videos
Empty the Recently Deleted album
Turn on iCloud Photos
Optimize iPhone Storage
Delete old messages and attachments
Set Messages to keep fewer messages
Remove downloaded music, podcasts, and videos
Clear Safari history and website data
Delete offline files from apps
Review and delete large files in the Files app
Remove duplicate photos and videos
Delete old mail attachments
Restart the iPhone after cleanup