Are you sure the drive is USB-C and not Thunderbolt 3? Because that'll determine the appropriate adapter.

Also, if it's Thunderbolt 3, is the cable built-in or is there a port on the drive into which you plug the cable?

For USB-C this should work: https://www.amazon.com/Satechi-Type-Type-C-Adapter-Converter/dp/B07KCL8WZK/

And for Thunderbolt, this is what you need, note it requires the drive to have a port, not a hard wired cable: https://www.amazon.com/Apple-Thunderbolt-USB-C-Adapter/dp/B01MQ26QIY