Lines on the screen

Okay so last year my macbook fell from a table straight down to the floor. The tip of my macbook’s lcd is dent now due to that fall but there were no lines or whatsoever. a year later probably 3 weeks ago, I woke up as usual and when I open my macbook I saw this horizontal line stretching from the tip of the right side of my macbook screen (the dented one) all the way to the bottom left. So I tried to touching the line, I felt nothing, no physical damage. Usually when something cracks, you can feel the crack with your finger but when I tried to feel this “line”, I literally cant feel any signs of crack and its probably damage from the inside but I have no idea how. What should I do? Should I fix this one or are there any other solution?

(the last image shows what happen if I apply pressure to the horizontal line, but it usually goes away after a few minutes to hours.)