I just came here to let you know that the battery drain has been solved on my Venu 3s seemingly by either of the following:
1. I recently have changed BACK the wrist setting from right to left. Originally I had started with the left wrist at the beginning of 2024, and switched to right later, but this did NOT cause a battery drain by itself. It started sometimes end of 2024 after a software update. Now it seems switching back to the left wrist solves the battery drain in my case, it now lasts again around 7 days per charge, which is much better than the 3-4 days before.
2. Another (less likely) cause for this could be some updates that I have received for the Garmin Connect IQ Store on-watch app (updated through the Android Connect IQ app). Or maybe some other updates that I have received for my other apps and watch faces? These seem much less like though.
Either case, give it a try, maybe it solves your battery issues as well.
Good luck!