Dell U2419HC monitor USB-C connection to Macbook (Retina, Early 2016)

Hi

I have recently purchased a Dell U2419HC monitor to use with my 2016 MacBook. I bought it specifically to use the USB-C connection and the USB ports on the monitor, but when I connect it with the USB-C cable and select USB-C as the input, it says:

"Scanning for signal", followed by "No USB Type-C signal from your device"

I'm therefore having to connect it with an HDMI cable.

Also, none of the USB ports on the monitor seem to work - they don't connect a device to the Macbook or charge the device.

I've read that Dell does not support Mac OS, but I'm hoping there's a work around.

Can anyone help me with this? Would purchasing a USB-C / DP adapter help?

The OS is macOS Mojave, 10.14.6.

Thanks!