Are you, perchance, running social media through the device?
A buddy of mine had the same issue with his wife's iPhone - she had a Facebook habit stretching back years, which somehow clogged the storage capacity. IIRC he just deleted the App & let her start over.
Don’t have any social media apps ( Facebook etc don’t have any music or games on it either ) thanks for the suggestions maybe try and reduce the quality down a bit if I can figure it .