1. Go to app settings-game booster-game booster settings-select balanced/power saving mode to less battery drain during gaming.
2. You can use battery guardian app of Samsung or bixby routine to optimize all background app and save battery during bedtime.
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