1. You have to wait for the OS to settle in, Android Nougat will recognize your habits and conserve battery that way. Same thing when you first set up your phone or do a factory reset. Can take a week up to a whole month.
2. Disable useless apps that are constantly running in the background such as LG SmartWorld (which regularly collects your data) and other preinstalled apps like Google Plus, Hangouts, etc. which you don't really need. Go to settings > general > apps (then click show system) > then go through every single app and disable the ones you don't use. If you cannot disable an app, look up how to remove apps through ADB commands.
3. Try clearing your cache or even a factory reset.. a factory reset is recommended whenever you update your phone since there's a lot of complications and junk during the process, it's best to start fresh.