Hi!

I have a Apple Watch Series 3 bought 2017 (4 years old already) that's not turning on or charging anymore.

Holding down both buttons (hard reset) will show the apple logo for about 1 sec, before disappearing again then zero response.

Went to Machines, they say cannot repair, ask me buy new one instead....

My questions:

1. Can recommend any shop/place that can repair the watch? I'm thinking it's probably a battery problem.
2. Estimated cost of repair and is it worth repairing?
3. How old is your Apple Watch that you are still using? (to get an idea of a typical lifespan of an apple watch)
4. Aside from telling time and health (steps/heart rate/etc) tracing, the most useful and frequently used feature that i like is the ability to unlock my phone when wearing mask. Are there any other watches or bluetooth device that can unlock our phone in a similar manner?

Thank you all in advance!