Display is damage but it's working

If the screen is working and you don't want to spend the money to get it fixed, you can keep using it, but I'd suggest putting a glass screen protector on it to keep from getting cut by any sharp shards of glass there may be. Otherwise you can save quite a bit of money by replacing the screen yourself; iFixit has a guide showing you step by step how to do that.

Xiaomi Redmi Note 8 Pro Screen Replacement - iFixit Repair Guide

I don't know what country you are located in, but a general internet search should bring up several options for where you can purchase a replacement screen. I usually start with the big three: Amazon, eBay and AliExpress, but you will almost certainly find more if you look. Here's an example that came up on my cursory search for that part.

Amazon.com: Screen Replacement for Xiaomi Redmi Note 8 Pro LCD Display Touch Screen Digitizer Assembly with Repair Tools (Black with Frame) : Cell Phones & Accessories

Good luck, and let us know how it all turns out for you!