Well you’ll need to replace the display assembly. Sadly because you had liquid damage Apple won’t service this system. If you hadn’t you might have gotten it fixed under warranty.
This is a known issue with the 2016 models many people got it replaced under the first year warranty as well as the extended AppleCare + warranty. Some folks who did not have coverage have been able to get it fixed under a warranty exception.
OK can’t cry over spilled milk.
Here’s the guide you’ll need to follow: 2017款MacBook Pro 13英寸带触控栏版本屏幕更换指南 while this is for the touch bar models it’s the same for the function key model as well. And here’s the needed part: MacBook Pro 13" Retina (Late 2016-2017) Display Assembly