How to get rid of other on my iPhone?

I only have a 8GB iPhone, but nearly half the usable memory is now 'other'. When i tried to back it up to clear some of the 'other', it said the iPhone does not have enough available space to back up my phone. Please help, I have deleted pretty much every app, reduced all my music file sizes, cleared camera roll, yet i still have hardly any available memory

Did you clear task, cookies, cache, histories, thumbnails and temp files?

You can't delete this folder as that is containing the OS files to run on your phone.

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