What to do if my Android keeps telling me that i have full storage.....?

What to do if my Android keeps telling me that i have full storage even tho i didnt download anything and apparently it fills itself with things that are invisible for me?
I cant even connect to wi-fi and i cant even look at the storage cuz there are only android apps+youtube and chrome and tthings that are pointless to erase- cant even. I tried erasing some wallpapers and other things and i didnt even have this problem for almost 3 or 4 months and it stuck me today and i dont know what to do anymore.....

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