Fedora/dnf makes installing additional desktops super easy, also with no risk to data. To hijack your comment a bit:
To install Plasma: sudo dnf install @kde-desktop
Logout and log into the Plasma session to use it.
To rollback, get the transaction ID of the above: dnf history list
And then rollback: sudo dnf history rollback <ID>
If Gnome’s fonts/icons don’t revert, install and open gnome-tweaks and reset settings.
Nice, waiting paid off. I’m actually interested in picking up the new God of War and Horizon games now.