I have a S20 regular exynos model and like all of you I have been facing terrible battery backup the day I bought my phone. I don't use AOD, use screen at 60hz with FHD display. I have put most of the apps under deep sleep category except for those which I need to use multiple times a day ( Gmail, telegram WhatsApp).
I don't use dark mode, I hate it.
I stream music atleast 1.5 hours a day over by BT headsets and speakers combined. I play COD for 1-2 hours.
The tip I am going to give you will help you increase the standby time. It has helped me a lot. I had to charge my phone 3 times a day (sometimes I am heavy on calls and video calls) now I charge roughly 1.5 times or with mild usage it gets me through the day.
Do this
Open Google maps, click on your icon in the search bar, go to settings then notifications and turn all of them off. It
This has brought me visible changes in battery backup. Give it time like 1 charge cycle and see after that. I am hopeful that this will work for your as well.
