Hi kwp217
welcome to the Apple (user-to-user) Community!
Re: "Apple watch Series 6 just blinks"
See if this article helps:
✽ How to: Restart Apple Watch - Apple Support
Else:
✽ This discussion thread on a similar situation tells how to erase the Watch settings
Apple Watch blinks logo while charging. W… - Apple Community
Eg: fieryjack says:
Try this;
"Press and hold both the side button and Digital Crown for about 10 seconds, then release both buttons when you see the Apple logo.Wait a few seconds, then hold down just the side button for about 20 seconds or until the “erase all settings” prompt shows up on the screen, then click it, then click the green check button".
ie: That method seems to have helped many people.
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Apple support have other articles online to help guide you:
✽ How to: Check your battery and charge your Apple Watch - Apple Support
and
✽ What to do: If your Apple Watch won't charge or it won't turn on - Apple Support
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Other options if needed:
✽ You can likely make an appointment at a nearby Apple Store, and have the Watch inspected.
The experts in the "Genius Bar" will either help you with advice, or give you a quote for repairs if needed.
Genius Bar Reservation and Apple Support Options - Apple
✽ There's repair info. available online : Apple Watch Service & Repair - Apple Support
✽ Apple Watch Support have a website online (info. / support / contact options etc.)
For online chat / phone / email etc., there is a "Get Support - start now" link
(NB: scroll to the very bottom of their webpage (link below)
Apple Watch - Official Apple Support
All the best :-)