Macbook no longer detecting Viewsonic portable monitor

I have a Viewsonic portable monitor (VG1655) which used to work with my MacBook Air M1 but now it isn't getting a signal. How do I get my MacBook to detect this monitor again? It seems to still work with other monitors.

MacBook Air M1

Ventura 13.2.1

I've tried all of the following:

1. Check the connections:
2. Check the monitor settings:
3. Restart MacBook Air
4. Check for software updates
5. Try a different cable
6. Try a different port