Hi @narcissist45528
Here's a [https://www.youtube.com/watch?v=5iia1mM7HR0|video] that shows how to replace the screen that may help.
Search online for [https://www.google.com/search?client=firefox-b-d&q=ROG+Phone+3+LCD+screen|ROG Phone 3 LCD screen] to find suppliers that suit you best. (examples only)
If doing this yourself seems too daunting, contact a reputable, professional mobile phone repair service and ask for a quote to fix the phone.