If you've done all you can and the size of your "other" storage is still preventing you from downloading and installing an update, you'll need to reset your phone to clear out as much "other" storage as you can.
Kung nagawa mo na ang lahat ng makakaya mo at pinipigilan ka pa rin ng storage na "iba pa" sa pag-download ng update, kakailanganin mong i-reset ang telepono mo para i-clear ang pinakamaraming "iba pang" storage na kaya mo.