Chosen Solution

My screen is shattered and there is some black/ green horizontal little thin lines in the corner of where i dropped my phone. (Bottom right) the lines dont go all the way across the screen. Now can i remove it by massaging it? If not can i just ignore it or itll spread? Do i ABSOLUTELY have to fix it by taking it to a repair?

Massaging the screen will only cause more damage in my personal experience. I highly recommend that you replace the screen so that you can use your phone at full functionality again because the damage will only get worse over time. You can replace the screen with the part and guide below. iPhone 7 Plus Screen iPhone 7 Plus Screen Replacement