I am unable to update my series 3 watch
My apple 3 series watch will not update
Apple Watch Series 3, watchOS 7
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FWIW, a lot of people are having problems updating a series 3 watch due too insufficient memory. Try unpairing, erasing, and pairing your watch again and restoring from the backup just created in the unpairing process. This deletes all temp and corrupted files and re-indexes the file system. This should result in no loss of data and in some cases can free a lot of storage.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support
If possible, your best option may be to make an appointment at the Genius Bar in an Apple Store near your and let them update it for you:
Genius Bar Reservation and Apple Support Options - Apple