Not enough space

Hello.
How is it possible that even though I have less apps than ever, my storage is still full? Pictures, videos and music are on my SD Card, everything that can be on my SD Card is there. I clear caches and uninstall apps, yet eventually, I still fill my storage. Is there some junk data somewhere that even Clean Master doesn't see? Because this makes no sense. I used to have tons of games and apps and still had space for more. Now I have no games and only the most trivial of apps, yet somehow I have no room for anything.

What can I even do at this point? All the apps I can unistall take about 300Mb of space, which is nothing compared to the other 1,1 GB of space used. I know that the OS is using some space, but what takes up the rest? I can't wrap my head around it, sometimes I am just thinking of restoring factory settings and removing everything, but that can't be the only solution. This makes no sense.

Any ideas?

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Not enough space