1) Turn off siri suggestions & privacy and all the app watching it does. System Settings -> Siri & Spotlight -> Siri Suggestions & Privacy. It turned it off for every app.
2) Turn off siri all together. System Settings -> Siri & Spotlight -> Ask Siri Toggle
3) Turn off Spotlight for everything you do not need. System Settings -> Siri & Spotlight -> Search Results check boxes
4) Turn off login items. System Settings -> Login items. Remove what you do not need from the list.
5) Turn off run in background items. System Settings -> Login items -> Allow in background
6) Remove items from ~/Library/LaunchAgents/ that you do not need. I had an old docker vnet item that wasn't needed.
Other than #6, you can do the first 5 things on all of your Apple devices and it makes a big difference in battery life. I just did the same steps with my phone and ipad.
I hope this helps your battery life a little bit.