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How To – Android Authority
It’s not the fad it once was, but some folks still like installing custom fonts. It’s still very doable, although the process is a little more obscure than most. You can also create your own fonts and install those. The whole thing only requires a couple of apps, some time, and some patience. Please note that this may not work on all phones, but it should work on most. It should also work up through Android 12, and it shouldn’t require root.
Please note that your phone needs to be able to change its own font in the Settings for this to work without root. You’ll need to root and use a custom Magisk module (creatable in zFont) to change your font otherwise.