Since updating One UI 3 and android 11, battery drain issue came out of nowhere. Now after having march 2021 update, battery drain issue is still here

After the s10+ One UI and android 11 update,  overheating issue suddenly appeared out of nowhere. And after having the march 2021 update, overheating issue is still here. I dont know whats wrong with those updates. 

The last update mentioned improved camera performance. That update made the over all camera performance worst. All of my friends who use s10 series phones encountered the same problem. Is Samsung giving update to s10 line up to become obsolete? Im so...