In addition to what Barry said above, I deal with users having nvidia problems here a lot.
Steps 1-5 on the blog you linked are correct, but step 6 is not.
To fully install the nvidia drivers from rpmfusion you need to
- enable the 3rd party repos in the gnome software app.
- from the command line install the drivers with
sudo dnf install akmod-nvidia xorg-x11-drv-nvidia-cuda - Allow about 5 minutes after the install completes for the drivers to be compiled then reboot.
At this point the drivers should load and be functional
The installed nvidia packages can be seen with dnf list installed \*nvidia\*. Please post that so we can see if everything needed is installed.
The loaded modules for the GPU can be seen with lsmod | grep -iE 'nouveau|nvidia' and if it does not show lines with nvidia modules then the modules did not load properly.
The boot process loading the drivers can be seen with dmesg | grep -iE 'nvidia|secure|nouveau'. Please also post that for us.