Jumpy Now you have no proprietary Nvidia driver installed and your system uses nouveau (the open source driver).
What you need to do is use one of the commands I posted at the start of the thread. It sounds like you installed ALL of the nvidia-470-* driver packages, which will include both the modules for the current and LTS kernel, which I think (without testing) will cause issues.
So if you use the linux-current kernel (i.e. the default, if you haven't manually switched to LTS), use the following to install the drivers:
sudo eopkg it nvidia-470-glx-driver-current
(and make sure your system has all updates installed too, to avoid a mismatch between driver and kernel)