Apple Watch series 6 won’t turn on

Hi there. So I have recently gotten an Apple Watch series six. The first time it died fully I put it in charge and it showed the time (top right) and green bolt(top left) I came back a few hours later to take it and it was still in this face. I then took it off charge and the bolt turned red. I tried restarting, rebooting, making sure the back was clean, everything. Anyway it eventually turned on. Now the same thing has happened but it has lasted for a day now and nothing happening and not sure what to do as I don’t know how it turned on the first time… Please help :( I have read the Apple support already but I am a new Apple user so I could just be missing something