Sadly the display will need replacing. The cause is likely from a heavy object pressed on the lid causing the brittle back glass to fracture. Just like a window the crack can grow causing the glass to segment it’s self. The problem we have here is the metal oxide traces which pass across the glass are severed so the area is not getting the needed signals.
Finding the needed part is getting hard as they are no longer being made and many had issues with the antiglare which your screen also has.
Save your pennies but don’t wait to long! Here’s one source for the needed part [https://www.amazon.com/GBOLE-Replacement-MacBook-661-8153-Assembly/dp/B0CN8T39C6|13” MacBook Pro display assembly P/N 661-8153] And here’s the guide to put it in [guide|27834]
If you can get a Thunderbolt to HDMI adapter you can use a TV or display instead that’s the cheapest way but now you have a desktop type of setup.