After many tries, I've received an answer on the Debian User Forums that actually worked for me, and although it may not solve the problem for everyone who is experiencing it, here it goes:

-I replaced the Nouveau drivers with the proprietary NVIDIA drivers that were available at the apt repository that Debian provided

-I installed the nvidia-xconfig utility and used it with the --prime flag

As I was using LightDM as my display manager, I also created a setup script on /etc/lightdm with the following content and made it executable:

xrandr --setprovideroutputsource modesetting NVIDIA-0 xrandr --auto xrandr --dpi 96 

Configured LightDM to run the script by editing the SeatDefaults section in /etc/lightdm/lightdm.conf

Restarted LightDM

If you're interested in following how that was solved, please check it here. Thanks CynicalDebian!

After many tries, I've received an answer on the Debian User Forums that actually worked for me, and although it may not solve the problem for everyone who is experiencing it, here it goes:

-I replaced the Nouveau drivers with the proprietary NVIDIA drivers that were available at the apt repository that Debian provided

-I installed the nvidia-xconfig utility and used it with the --prime flag

I put this on my .xsessionrc:

xrandr --setprovideroutputsource modesetting NVIDIA-0 xrandr --auto xrandr --dpi 96 

If you're interested in following how that was solved, please check it here. Thanks CynicalDebian!