My Iphone 5c is having screen issues. How can I fix these issues I can open the phone and fix it but I don't want to get new screen?

My Iphone 5c is having screen issues. How can I fix these issues I can open the phone and fix it but I don't want to get new screen?

Added (1). There's some screen burn and the screen is glitching.

You can't fix those issues. You have to buy a replacement screen.