Flickering Screen Even After Resetting SMC and NVRAM

Part of my screen (mostly near the bottom and the left side edge, as shown in the photo below) has been flickering as long as the display is on.

Following tips from the internet, I attempted to reset the SMC and NVRAM. Oddly, it showed "No Issues Found" when I ran the Mac Diagnostics.

Despite an effort to solve it, the screen keeps flickering (even in safe mode).

Is the problem permanent?

If not, are there alternative ways to solve it?

(Photo of the flickering)

Thanks in advance for replies!!!