My phone doesn't work

So I sat on my google pixel 3 xl. When I did so I heard a crack sound like a screen broke. I got up and looked at my phone and it will not turn on, vibrate, or make any sounds to let me know if it still works. Before I sat on it had a cracked screen in the very bottom corner, not even where the OLED screen is, it’s right next to the speaker. Everything still worked just fine before this. Google wants me to fix the screen then they will try to fix the problem. I just want to know if you guys think you know what could have caused the problem, so I can fix it myself or something.