What is the screen time?
You can check the battery usage to find out whether you can find out the app that actually drains battery.
You can also try this app to force some inactive apps to sleep. https://play.google.com/store/apps/details?id=com.oasisfeng.greenify
(you need add third-party apps to the list. When you are no going to use the phone for more than 2 hours, you can force the apps to sleep.)