How do I fix my Apple Watch Series 6 not turning on?

Fully charged this morning, worked fine all day, then suddenly went black. Showed the Apple logo for a few seconds then completely black and dead. I immediately put it on the charger to no avail. It’s just sitting there black and dead. I checked the phone app and it stopped gathering data at 3:43p.

Can this be fixed? What do I need to do?

Apple Watch-Less

[Re-Titled by Moderator]