How to manage the storage
How to manage my full storage
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Apple support's article *links below) have some tips that may help:
It's a good idea to back up everything on your iPhone before deleting anything:
How to back up your iPhone, iPad, and iPod touch - Apple Support
How to use iPhone's storage "reccomendations":
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
More info:
How to use iCloud to: Manage your photo and video storage - Apple Support
or
Delete photos on your iPhone or iPad – Apple Support
How to: Clear Other storage on your iPhone or iPad - Apple Support
All the best :-)