How can I get my display to work again?

My screen came out so I took the phone apart and re-glued the screen with some 1mm 3M tape. Now I reassembled it and it vibrates on boot and I can see the backlight go on because a corner of the screen is broken off… Also WhatsApp Web works. So the phone is definitely working, but the display isnt showing anything (Backlight does work tho)… I re-checked the main screen connector at the bottom and it is properly plugged… what can I do?

P.S.: I followed this tutorial for the process: https://www.youtube.com/watch?v=oDEZjsqN...