doneUpdate your post to include full system hardware specs and OS information.
Make and model monitor?
I'm using a usb c to dp cable, the monitor is correctWhat USB-c port is being used for video output?
This monitor - correct?
https://tinygrab.com/asus-vg248qe-gaming-monitor-review/
Double check the monitor's User Guide/Manual and menus to ensure that the correct monitor input (DP) is selected.
Generic Asus link:
https://www.asus.com/us/support/FAQ/1012723/
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If you go back to using the HDMI cable does the display header re-appear?
Do you have another usb c to DP cable to test or are you able to test the cable you have on another known working system?