What do these screen issues indicate?

I have a Samsung A20 phone which I purchased in 2019 July. Since last 2.5 weeks, there is a thick white vertical line at the right corner of my screen. Since last 3-4 days, a small purple blotch appeared at the right bottom of my screen.

2 months ago, I got my screen replaced from a local store after the screen got blackened by dropping on floor.

That thick white line didn't occurred due to phone drop. I did all software troubleshooting methods but still not able to get rid of the line. Now I am facing another problem (purple botch). I wish I could fix this issue at home. I have no idea what is it. The white line started with one green vertical line at the beginning.