I recently purchased my zenbook 14 UX434FL and it was giving me around 9-10 hours of battery life, and suddenly after 4 weeks, it's battery life dip to 3-4 hours, Please help
Same here... Maybe you should try turning the stream HDR off as well as playback settings to "optimize for battery life" also turning Tru2life helps... Also check Chrome or any other program in task manager for the battery consumption as sometimes chrome or other programs uses so much CPU usage due to some bug even when not using.
Also disable the not required application at the start-up in Task manager.
I did all the things you mentioned but nothing worked
use windows builtin power troubleshooter ,
also check the battery current charging full capacity . using powercfg command .
You can check the battery degradation in intel graphics command center > system > power... After a year of use I'm at 43.4 Wh... Which is like 13% degradation...