For some reason a lot of applications out there do not have a built RPM package. Fortunately, there are a bunch of applications built into snap, so we can install snap and then install Discord.
You can also use the copr repo. Visit the following link for instructions.
Install Snap Store
sudo dnf install snapd
snap install discord
You may need to try signing out and back in or restarting your computer for the applications to show up in your application menu.
You can also manually run the application with
snap run discord