Nvidia-settings isn't remembering my config changes

I managed to save config to the xorg.conf.d folder as 20-nvidia.conf, this part works.

However, the settings part won’t load. Even with autostart settings.
First I got an error when loading nvidia-settings --load-config-only through terminal.
The error was something with Local C language. This I got fixed by changing the local to default in Regional settings.

Then I retried loading the settings through terminal, this time no error, but also no change in the ‘nvidia-settings’.

What may I have overlooked here?

PS. I’m using KDE as DE.

PSS. Using with -V command I get the following:
ERROR: Unable to find display on any available system
That’s interesting, I’m using only nVidia card with no built-in display.

lspci -nnk | grep VGA
08:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM204 [GeForce GTX 970] [10de:13c2] (rev a1)

nvidia smi