Delete unused apps
Offload unused apps
Clear Safari history and website data
Remove old messages and large attachments
Delete duplicate photos and videos
Use iCloud Photos with Optimize iPhone Storage
Back up and remove large media files
Empty Recently Deleted in Photos
Delete downloaded music, podcasts, and movies
Review and remove large files in Files app
Clear app caches when available
Delete offline maps and other offline content
Reduce message retention settings
Remove old email attachments
Check storage usage in Settings and delete the largest items first