Make sure your device is in Optimized power mode. Add the app you don't use in Sleeping apps list so that they don't run in background. For more details you can see this link:
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Battery life varies. It depends on the usage of the phone, the apps being used, the length of time the apps are used, and other factors. For example, my battery life on my Note8 is generally 10-12 hours with 2-3 hours being hard use.
You can try keeping your bluetooth on only when using it. Same as location.
Keeping bluetooth or location on when not using them causes major battery drain.
I would also recommend putting your phone into 'medium power saving' mode. This will have your phone perform as pretty much normal but with much better battery life.