I apologize up front that this is a complaint for which I am at a loss for solutions.
I have posted a few times here about battery life issues and have used many of your suggestions to slightly improve it. I no longer use it for recording GPS activities, except golf once per week. It does well at distances and recording score, but I need to restart the watch before a round to ensure it records the activity. I have stopped using PulseOx, removed the CIQ watch faces, MoveIQ off, AutoActivity off, and more. I bought an Edge for my bike to better track cycling and use the VA4 to broadcast HR.
It is essentially reduced to a smart watch, golf tracker, and heart rate monitor while cycling. I now use Strava on my phone to record walks, which I used to track on my watch. I am not sure what to do at this point, as I really want to like this watch as much as I did my VA3.
I have had it replaced twice (once through Amazon and once through Garmin) and the most recent one has a squishy button to top it off.