There are many ways to grow Google traffic, but for an AdSense publisher, it's important to understand Google's policies as much as it is to understand about publishing and marketing.
Google wants its publishers to be compliant to the policies to protect the integrity of its system, and as a publisher, you'd want to retain your own integrity.
To that end, google wants you to make sure you fully understand its own policies and procedures, and would encourage publishers to have their own policies, too.
There's a beginners guide to the most common policy violations. [support.google.com
Invalid traffic is another avenue for investigation, and publishers should learn how to identify invalid traffic, and how to mitigate it. This resource might help [tagtoday.net
Publishers ought to understand their user metrics to learn about patterns. If a pattern suddenly changes it may the sign of a problem.
If you work with business partners you should make sure they are trustworthy, and don't get complacent. Ensure there are quality inventory sources, and drop those that may even change negatively.
On the topic of metrics, and when working with partners, again, understand the traffic sources to ensure it's not suspicious behaviour. If not, this could be a negative point and could, potentially, be the loss of the AdSense account.
Overall, make sure it's a good user experience.
Best practices for policy compliant growth [adsense.googleblog.com