How to free up the space occupied by other on iphone? 32gb iphone 7 has 20gb space occupied only by other. Tried almost everything?

I have an iphone 7 32g that I bought only a few months before. I barely have apps or photos or voices and I've deleted my browser's caches recently. There's 20gb space occupied only by "other". I don't know where all this 20gb comes from and don't know how to get rid of it and I think it's too much and not normal. I searched and found some solutions but not of them helped. I tried to delete and reinstall apps, delete photos, delete caches but nothing happened. Is there something wrong with my phone? What else can I do to fix this?

Without actually seein the phone it's hard to say! What I would mention though is that photos and music can take up far more info than people realise. One thing you can try is to back up all your photos, music, and other stuff 9including contacts. The reset your phone so that everything is wiped and just re-install the stuff that you want and that you use!