How can I turn up the volume on my watch?

Greetings Rupert2020,

You can learn how to adjust the volume on your Apple Watch here:

Change the audio and notification settings on your Apple Watch

"How to turn your Apple Watch volume up or down

1. On your Apple Watch, open the Settings app.
2. Scroll down, then tap Sounds & Haptics.
3. Tap the volume down button  to decrease the volume or tap the volume up button  to increase it. You can also tap the slider, then turn the Digital Crown."

Take care.

This should help:)

Change the audio and notification settings on your Apple Watch - Apple Support