I am sorry, but you seem to be using the wrong screwdriver for the job. You seem to be using a tri-wing screwdriver on a triangle head screw. You will need a screwdriver that is the correct shape. Here is the correct screwdriver: https://www.amazon.com/Silverhill-Tools-ATKTR4-Screwdriver-Replacement/dp/B004IUEHYS P.S. If you want to get a whole set of different bits, you can buy a kit, too. iFixit’s are really solid, but there are cheaper kits on Amazon you might also like. Happy to reply to any questions you may have.
Does the phone make any sounds or vibrations. If that is the case, then it’s just the screen that has been damaged, otherwise, it might be something else.