I change my Apple Watch 4 44mm screen but still off, what can I do?

I change my Apple Watch 4 44mm screen but still off, what can I do?

So I ordered the iFixit replacement screen for the Apple Watch 4 44mm and I changed it but since I’ve change it the screen stills black. The Watch is on because it vibrates and the buttons respond with vibrations but the screen stills off. I’ve tried to put the broken one again and still black, What can I do?