Turn of syncing
Turn off AOD (if available)
Clear background apps
Put unnecessary apps on sleep and deep sleep
Draining 6-7% is normal if your device is old enough.
Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve your device battery drain issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-battery-drain-issue/
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support