Apple Watch 7 not working.

I have the Apple Watch Series 7 (Nike) and it's suddenly stopped working.

The screen is completely black however it seems like it's working fine underneath the black screen. It vibrates and still makes noises. I unpaired it from my phone when I reset it in an attempt to fix and now I can't see the screen to repair it, despite my phone constantly trying to.

I have watched just about every YouTube video going. The screen is still black when I try the hard reset/charging/massaging/tapping. I even heard the watch telling me VoiceOver is turned off when I was attempting to use Siri and randomly tapping the watch.

I know I should probably take it to get checked but was hoping to fix it myself before spending even more £££ on it. It's only a few months out of warranty, and I barely wore it throughout my recent pregnancy, so didn't expect it to break so soon.

Any help would be appreciated!