open device care an toggle on light performance, this will reduce CPU speed when open social media apps but when you open any game it will back to normal speed, this is good because social media apps don't need speedy CPU
personally FHD+ resolution for 6,9 or smaller screen is more than enough for me, but sure if you watch 4k Netflix or YouTube then keep your QHD+
turn off AOD and turn on power saving mode during your sleep time, you can set this automatically everyday in mode and routines settings
last choose LTE as your maximum internet connection for your active SIM, only use 5G when you really need to download huge files like 1GB or bigger, 4G already fast enough for video call, meeting call, or send/download file smaller than 1GB
