Chipped board when opening up phone. Is it fixable?

I've just replaced the screen on a pixel 3a but in the process I accidentally dug too far and the power button (and possibly the sound button) no longer works and it won't switch on.

I opened it up and I think I've chipped a little off the circuit board by the power button which could explain it. The case is a little chewed up around the area too.

The new screen works however but I can just no longer switch it on.

I'd like to save it if I can but I will have to see how likely it is and how much it would cost.

Do you think this is fixable?

I've included shots of where I broke the board and where it came off.

It could however be something different but the power button was working fine beforehand.