Why does my phone won't turn on?

My iphone XR was in 52% when I last checked it and after a few hours, it's already a black screen. So I thought it was turned off so what I did, I tried turning it on, but it won't turn on. Then I searched for other ways to turn it on, I also tried the volume up volume down power button but still, it didn't work. My phone did not fall, got wet, or anything. I don't know what to do anymore please helppp