USB-C cables not connecting Apple Neo laptop to LG Monitor

¿Exactly what model LG display?

Not of lot of detail provided.

Are you sure that the monitor isn’t expecting a Thunderbolt connection ?

FYI: Your MacBook Specs:

• Supports one external display with up to a native resolution of 4K at 60Hz
• Simultaneously supports the built-in display at full native resolution
• USB 3 (USB-C) port supports native DisplayPort 1.4 speeds (up to HBR3)

Ref:

MacBook Neo - Tech Specs - Apple