How to get the volume to work on my iPhone 4s?

Everything volume related has completely disappeared from the screen, there's no way to change the volume (including assistive touch, control center, and the buttons). I know it is not a problem with the speakers, because if someone calls me the phone will ring, but volume does not work anywhere else. I tried restarting, getting a software update, cleaning the ports with a toothbrush… None of it seems to work.

Press Settings. Press General. Press Reset.
Restore settings

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