Open Settings
Tap Storage
Review what is using space
Tap Apps and clear cache or uninstall unused apps
Delete old photos and videos
Empty the Trash or Recently Deleted folder in Gallery or Photos
Remove downloaded files
Delete unused documents, audio, and APK files
Clear app cache for large apps
Move files to cloud storage or a computer
Delete offline downloads from streaming apps
Remove duplicate files
Uninstall apps you do not use
Restart the phone after cleanup