Turn on a full-screen white or gray image for several hours to reduce temporary image retention
Lower screen brightness
Enable auto-brightness
Use dark mode where possible
Change wallpaper to a dark or moving image
Hide the navigation bar if possible
Reduce screen timeout
Avoid leaving static images on screen for long periods
Use immersive/full-screen mode for apps
Run a pixel-refresh or screen-fix app if available
Update the phone software
Factory reset only if software issues are suspected
Replace the display if the burn-in is permanent