I cant open my apple watch there no any display too
Apple Watch Series 6, watchOS 7
User profile for user:
Community User
Follow these steps which will return your watch to factory settings;
From a web browser,sign in to iCloud.com with your Apple ID.
Go to Find iPhone.
Click All Devices at the top of the screen.
Click your Apple Watch.
Click Erase [device]. Select Next until the device is erased.
Click Remove from Account.
Then follow these steps;