Go in battery settings, and put all the apps in deep sleep, even the ones that you regularly use, like youtube and facebook.
Only leave those, that you need for some background work or for the notification.
Like leave the Uber out, because you will need it's notification that when ride is arriving. If you put uber too in deep sleep, then still you can use Uber without an issue, it will just not send you any notification nor it will refresh in background, but when opened, all deep sleeping apps work normally, so there's no issue in putting the app to deep sleep.
For example weather app needs to work in background to show you latest weather in widgets, but if you're not putting any weather widget, then put weather into deep sleep too.
But Don't put whatsap, gmail, messenger type apps in deep sleep because you need their notifications on time. Also don't put system apps like clock calender in deep sleep, otherwise you'llmiss alarms. There's no issue in putting calculator (or other similar apps) in deep sleep since you don't need them to work in background and don't need their notifications. I hope you got the idea
I am now running Andorid 15 with OneUI 7 on 4GB A04, and working smooth. Before, it was hell.
