So I also had this problem where my 64 gb Iphone XS had 32 gb of system data and I tried deleting apps and checking documents of apps and using cleaners for iphone and clearing cache from apps but the thing that worked for me is restarting my iphone. After that firstly the sistem data droped like maybe 5 gb but after 10 minutes it’s at 11 gb. I hope this helps
Dzoni33
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