Modern phones bond the LCD and digitizer to the front glass. Separating them generally requires using a vacuum table to hold down the display while you use a fine wire to separate the glass. Following that you'll need to clean the old adhesive completely then add a layer of optically clear adhesive (OCA) between the new glass and the LCD. Put the assembly into a vacuum chamber to remove the air bubbles, then into a UV chamber to cure the OCA.
Kind of a lot of trouble and adhesive, assuming you can even find the front glass; that may or may not be available for you particular phone. I would suggest just replacing the complete screen assembly; a quick search online shows some inexpensive screens selling for anywhere from $15 to $30 USD. Here are a couple of the cheaper examples I ran across with just a cursory search.
[link|https://www.aliexpress.us/item/3256806071491782.html|6.74" High Quality For Xiaomi Redmi 13C LCD Display Touch Screen Digitizer For Redmi 13C Display LCD 23100RN82L Replacement Part - AliExpress 509]
[link|https://www.tvcmall.com/details/for-xiaomi-redmi-13c-4g-5g-redmi-13r-5g-poco-c65-4g-poco-m6-pro-5g-grade-b-lcd-screen-and-digitizer-assembly-part-without-logo-sku660182108a.html|Wholesale For Xiaomi Redmi 13C 4G / 5G / Redmi 13R 5G / Poco C65 4G Grade B LCD Screen and Digitizer Assembly Part (without Logo) Custom Available - TVCMALL]
I wasn't able to locate a written guide like iFixit provides, but there are YouTube videos available, such as this one.
[link|https://www.youtube.com/watch?v=M2rO4KzBhI8|REDMI 13c LCD Replacement - YouTube]