Why does it have a distorted portion of screen?

i mistakenly dropped it from my apart men and it fell 20 feet. it had no damage just the screen wasn’t working everything else was fine. i replaced the screen by a professional and it didn’t work. i gave up. then after a month, it booted up and the screen was distorted. now it works fine just the display is distorted but i want to fix it so i don’t waste money for buying another phone please give me recommendations. here is an image of it.