Be sure to backup your data before attempting the steps below.
Try wiping the cache from your apps, you might have to go through each app you use.
You can also wipe the system cache by turning off the device, hold down the volume up, home key and power button until you're at the recovery menu. Once there, navigate to "wipe cache" with the volume keys and press the home/power button then restart your device.
I hope this helps!!
I hope you are doing well.
The storage memory running low on your device is your actually internal storage not your cloud storage. Deleting anything from your cloud storage will not free up any space on your device. If you want to free up space on your device without deleting any precious photos, I suggest you try to delete apps that you do not use. Most of the time by deleting unused app free about 40% of internal storage.
I hope I was able to answer some questions and a solution for you.
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