Apple Watch SE won't update its firmware

I have an Apple Watch SE (2nd gen) and it's stuck on watchOS 10.6.1. I have tried:

• Rebooting the watch
• Erasing the watch
• Unpairing and repairing the watch
• Selecting beta updates

Nothing works. Is there a nuclear option I can try?

Please don't send me to the usual Apple Watch update help page. It doesn't help. Please don't advise me to take it to an Apple Store as there are none near me.