how to download printer driver canon G3000?

Hi,

Have you tried the September 2021 drivers on the following support page?

https://asia.canon/en/support/PIXMA%20G3000/model#download

Reset the Mac printing system to solve a problem - Apple Support

Add a printer on Mac - Apple Support

In theory, deleting the Printer instance in the Add-A-Printer pane, and then re-adding your printer is supposed to cause the indirect downloading of the appropriate Printer Driver package.

Some Printer-makers have walked away from supporting their printers in modern (Big Sur and later) MacOS, leaving them to use AirPrint or generic postscript, if capable, or leaving them high and dry if not capable of those generic drivers.