Just post in on the internet repeatedly. Drug cartels do not respond to people they did not meet organically. You could be a cop trying to set them up, so they

Just post in on the internet repeatedly. Drug cartels do not respond to people they did not meet organically. You could be a cop trying to set them up, so they ignore you. You could be a rival looking to harm them, so they ignore you. If you get too annoying, they may hurt you. People who value human life do not generally traffic illegal / street drugs.