Hi,
I have the exact same problem on my new pixel 8. I switched from iOS over a week ago and love the new "freedom".
Unfortunately the battery live, especially on cellular, is pretty weak for me. The Threema libre consumption seems okay, but signal and especially home assistant in the minimal version are power hungry.
Still have no luck to figure out how to get better battery live without losing functionality.
On the main profile I did not use any g-services. And the only apps that are running in the background are Threema, Signal and Home Assistant. The battery live is the only downside so far. Maybe someone have an idea what I can change.
Otherwise the phone and OS are absolutely great and I'm not looking back.