Have you tried transferring your important/wanted files onto a hard drive or your PC then going through and delete all the stuff you don't want or have all ready savd to your PC or hard drive.
if you have to much stuff to go through make sure you have everything saved on the other devices and do a factory reset that will remove EVERYTHING on your tablet. Then if its an iPad you can hold the lock and home button down until it resets, other tablets I'm not to sure how to manually reset them.
Make sure you back every thing up.
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