Update iOS (it will lead to downloading new Debug Symbols later when connecting phone to Xcode in “/Users/{username}/Library/Developer/Xcode/iOS DeviceSupport”)
Delete Debug Symbols for previous iOS version after completing downloading for the new one > the whole folder called “iPhone…{ios_version}…”
Delete Unity iOS build folder
Delete Unity Library folder
Delete appropriate project in “/Users/{username}/Library/Developer/Xcode/DerivedData”