Boost the Haptics
If you’re missing notifications on your Apple Watch because the haptics aren’t strong enough, check your bands. If the bands are too loose, then the “tap” your Watch will give you will be a lot weaker. But if the haptic still isn’t strong enough, you have a couple software settings.
Go to the Settings app on your Watch and select Sound & Haptics. You’ll find a slider that allows you to control the strength of the device’s haptic feedback. There’s also a “Prominent Haptic” option that will automatically boost the haptic feedback for common alerts.