iPhone is not responding to touch

My phone died, so i plugged it in. when it turned back on, it started to not respond to touch on the screen. i can use the side button, but that's about it. i've tried to do the up/down/up volume button and holding the side button, but my down volume button is stuck and hasn't worked in a long time (i cleaned my phone with rubbing alcohol and used a pin to try to unstick it, and that kind of helped but not enough for it to click like the up button). i'm not sure what to do at this point. my phone is currently charging but i may wait for it to die again and see if that fixes the issue. any ideas of what could have happened or what i can do if it doesn't start working on its own again?