Some things that haven’t been proposed here might be to use it as a nas. If you want to access your films and shows from outside it’s easier to set up Plex instead of jellyfin for now. You can use it also as a steam machine streaming from the pc to the tv, or as Kodi/Libreelec mediacenter to make your tv smart
Windows doesn’t manage installed applications, only those from the Store, but you can still manually go to the installation folder and remove it.