I saw some post that they did it and it didn’t work for them, so I was wary to do it, but at that point the battery was draining so fast what did I have to lose. So far it’s way better not exactly how it was before but better, took it off the charger at 6:50am it’s now 1:05 and it’s at 81 so 6 hours 19% lost. Yesterday I lost 30% in 2hrs.
As others have said, there is a little power button on the top right, but if that doesn’t work you can do a soft reboot, by holding down the crown and action button until you see the apple logo.