2020 Macbook Air M1 screen replacement, Screen is glitching.

my macbook screen starts to glitch whenever i try to completely pull the screen to an angle where it is comfortable to use, but as soon as i do it, it starts to glitch and when i again try to pull it down to a certain angle it works completely fine. My only question is, in this situation do i need to replace the screen, or it is repairable?

That is a classic symptom of a worn display cable. Unfortunately the entire display is one sealed assembly. Any failure of one component—even the cable—requires a complete new assembly to fix. I see them used at US$400 for that Macbook Air model. That is for the part only. If you cannot do the work yourself, add US$75-150 for labor.

You can check with Apple but we have reports here from people who had Apple replace the display. They say the cost started about US$ 500 parts + labor assuming nothing else was wrong.

You can fix it, live with it, use an external monitor, or reapce the computer. The latter may make the most sense.