Change the Devanagari font on Linux

80-prefer-devanagari.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">

<fontconfig>
    
    <!-- Set Mukta as the Devanagari font. -->
    <!-- We will remove Devanagari characters from all fonts except Mukta. -->
    <!-- Idea courtesy: https://stackoverflow.com/a/47614324 -->
    <!-- Pseudo code: -->
    <!-- for font in fonts: -->
    <!--     if "Mukta" not in font.family -->
    <!--         font.charset = charset.all - charset.devanagari -->

    <match target="scan">
        <test qual="any" name="family" compare="not_eq">
            <string>Mukta</string>
        </test>

        <edit name="charset" mode="assign">  <!-- Edit the charset. -->
            <minus>  <!-- Remove chars from charset. -->
                <name>charset</name>
                <charset>
                    <range>
                        <!-- Devanagari (Normal) -->
                        <int>0x0900</int>
                        <int>0x097F</int>
                    </range>
                    
                    <range>
                        <!-- Devanagari Extended -->
                        <int>0xA8E0</int>
                        <int>0xA8FF</int>
                    </range>
                </charset>
            </minus>
        </edit>
    </match>
</fontconfig>

Change Mukta to any font you like.