Step #1
Run sudo dnf update once to update all your packages first.
Step #2
Then you need to add the RPM Fusion repository for NVIDIA drivers. To do that, open up GNOME Software and click on the hamburger menu (three horizontal lines) on the top-right corner. Then click on Software Repositories from the dropdown menu. There you will see this.
Select RPM Fusion for Fedora 32 - Nonfree - NVIDIA Driver and ENABLE it. It requires elevated privileges so enter your password and it will be done.