My phone has a black screen but not when charging

I dropped my phone 18 months ago and its been fine until a small fall yesterday. I picked it up and the screen was black and 2/3 where flickering white. I put my phone on the power pad and my screen started to work. It was flickering at first but I turned my brightness up it stopped. Even when I take my phone off the pad it still works but if I lock it it black screens again and wont work until I charge it.

I know ive damaged my LCD screen as it now has a white line where the crack is.

I have just over 3 months left before I can upgrage my phone. Im wondering if I do a soft or hard reset if it will stop my phone black screening and get me through the next 3 months as I use my phone alot for work.