I have some tips for you
• Turn on Dark mode
• Go to Settings, then Connections, go to More Connection Settings and turn Nearby Device Scanning off (it wastes a lot of battery).
• Uninstall any of your unused apps, it will help to save memory and reduce the background battery drain.
• Use a darker wallpaper if possible.
• Turn off NFC, Wifi, Bluetooth and etc when you aren't using them as it will save lots of battery.
Let me know if you see an improvement in battery life on your phone after you use my tips. Hope this helped!