These are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding. Your question is more of a product support one, so I'd suggest you ask it over at the Apple Support Forums. Thanks. System data is the System, i.e. iOS plus necessary files such as logs and cache files. That number will stay pretty static. There's not really a lot you can do to reduce that. Try and offload some of your data to iCloud. Enable iCloud Photos and turn on Optimise iPhone Storage in Settings > Apps > Photos. Regardless, you have a 64GB iPhone, which isn't that big these days. It might've been fine five years ago, but not really now.
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Community
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Apple Developers
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