System process on Pixel2 is uses 60% of my battery in just 4.5 hours. How can I troubleshoot?

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Android Central Question

My device is a regular Pixel 2 (Not XL).

I unplugged my phone at 9:30am this morning (at 95% battery life remaining) and the phone was running a little hot (as it always seems to lately). At around 2:00pm I checked the battery and it was at 23% battery life remaining. App usage lists 3 apps each having used 2%, 1%, and 1% (my phone, and a couple of messaging apps). I opened the graph and there is an entry called "System" that used a whopping 57% in just under 5 hours! Isn't that insane? The next closest entry was "Apps" and that was a measly (by-comparison) 9%.

Is there some way I can further diagnose this and find out what system process is causing these issues?

My phone will soon not be able to last a full workday :S.