Apple Watch not turning on
My Apple Watch stopped working and I know it is not because it’s not charged. When I charged it, it got hot and not showing anything happening.
Apple Watch Series 3, watchOS 8
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Getting hot is not a good sign, slightly warm maybe. It could be hardware failure in particular the battery.
Force restart the watch. i.e. press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.
If that fails to do anything
Apple Watch Service & Repair - Apple Support
If they recommend a replacement Series 3 watch go for the SE2022 - a quantum leap from the Series 3 at a lower price.
If it does restart you can check for damaged or self-discharging battery...
How to check your Apple Watch battery fo… - Apple Community