There are few things you can do immediately.
1) Switch on dark mode
2) Set mobile network mode to your specific operator e.g. LTE only for Jio
3) Disable marketing, customization, diagnostics from settings > privacy
Hope this will solve issue.
So basically in a way we all have destroyed our phones anyway because the first version of Android Oreo was the best version then came Android Pie in my experience I am using Galaxy M30 Indian variant doesn't matter from which country we buy our Samsung Galaxy smartphone or Tablet. Starting from Android Pie all have experienced a lot of issues till Android 10 and the next version as well never update your phone because of these new I don't know if it's old but still their marketing strategy is so bad and then here we are coming to the Samsung community or anywhere we could contact Samsung customer care service in any of our country region we bought our phone in. Now the lesson we have learnt is do not even upgrade from Oreo version ever even if we get new features we will still get new bugs and little and lags a lot!
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).
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Samsung Customer Support