Hi,
Here’s a [https://www.youtube.com/watch?v=FDRCbqk6aR0|video] that shows how to replace the screen assembly in a Stylo 6.
Replacement screens are available online. Just search for ''LG Stylo 6 LCD display touch screen digitizer assembly'' to get results for suppliers.
If doing the repair yourself seems too daunting, contact a reputable, professional mobile phone repair service and ask for a quote to repair the phone.