Hi I have my watch and the screen is black
how I can fix the problem I have with my watch?
Apple Watch SE, watchOS 9
The last step; in:
If your Apple Watch won't charge or it won't turn on - Apple Support
is:
If you still need help, contact Apple Support.
Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple