This video is a basic but effective way to help get rid of screen burn in or a stuck pixels on your screen. Let me know in the comments if it is effective for you.

If the video doesn't fill your entire screen then you should use a different video that does. My website has many common screen sizes listed on it to help you pick the right video.
www.screenburnfixer.com

If this doesn't work and you need a new monitor, consider this one: (amazon affiliate link)
https://amzn.to/338COdn