If you hadn't already, please enable iCloud Photo Library in Settings > iCloud > Photos. In that same settings screen you will see the option to optimize iPhone storage. Enable that one also. This will save some space on your iPhone.
But, first of all, please remember that by buying extra cloud storage, you are technically not expanding the storage on your iPhone, just on iCloud itself.
To free storage space on your iPhone you will have to delete some apps, photos and videos and other stuff.
02-22-2017 12:26 PM