Simple CSS to revert Discord's font change.
The CSS was made by Discord themselves (I don't take any credit for the CSS), however I'm hosting the fonts on GitHub in order to prevent risk of them being taken off Discord's Servers.
Download the theme file and put it into your BD theme folder (Win + R, then paste %appdata%/BetterDiscord/themes). You can also follow the method below.
Most client mods have a Custom CSS tab. Paste this line into the top of your Custom CSS.
@import url(https://cdn.statically.io/gh/Overimagine1/old-discord-font/main/source.min.css);Discord for basically making the css lol