Hi @henryowino
Here's a [https://www.youtube.com/watch?v=PAPK2jQbRQw|video] that shows how to replace the LCD display
If you wish to replace the complete display assembly, search online for [https://www.google.com/search?client=firefox-b-d&q=560001K7SR00|560001K7SR00] to find suppliers that suit you best.
If you wish to replace just the screen and digitizer, search online for [https://www.google.com/search?client=firefox-b-d&q=redmi+note+12+s+lcd+%2B+digitizer+unit|redmi note 12s lcd + digitizer unit] to find suppliers that suit you best.