All of this is advised by the manufacturer and stated in the manuals. Please see the next example with HTC:
We have found a workaround that may delete or reduce the pixel burn in the headset, this procedure has been done with an HTC VIVE FOCUS 3 headset. We think that the same procedure can be used in other headsets like Meta and PICO but we cannot assure it.
HOW TO REPAIR PIXEL BURNT LCD LED LENS:
- Put a sticker in the tracking sensor that is between the two lenses, doing that will prevent the headset from losing tracking at any moment.
- Ensure that Sleep mode is set to never in Settings/Advanced/Sleep mode.
- Open the VIVE Browser application and select YouTube or type it in the search bar.
- Search for LCD Image/Pixel burn fix stuck pixel burnt videos, this is the example video I used in my test.
- Play the video and set it to 360.
-Charge the headset and leave it at least one hour to see if the flickering has been reduced or removed, you may need to repeat this process a couple of times.