very simple: uninstall unnecessary apps /disable Google apps that u don't use. use black theme, keep charging circles 20% to 90 % , put apps in always sleeping which are u don't wanna refreshing in background also turn off background data usage, turn off sync on Google account some unnecessary like people. fit,duo , etc... hit ♡ if it works...
2 years battery it is expected follow both nobleprince and DJSLF's solution. Extra tip Turn off mobile data for a 2+ yr old battery if not in use and have a Volte e.g night time b4 sleep.
