Blog posts that lead to capturing names or going straight to sales. If you search google or YT, you will see people that drove 100,000’s visitors per month. Most of it was done with blog posts. Go after long tail keywords in your blog post, with a few big keywords. When you get a little traction and engagement on the pin, then run ads on it going after bigger keywords. So, write a blog post on “How to train a border collie to stop barking.” Then go after dog training in ads later on. How to, and list posts do much better.
Keep in mind that pin traffic reporting is usually delayed a couple of days, and the traffic isn’t instant like FB or Google Ads. I have seen some immediate traffic due to lockdown, many times, people save a pin and go back to it later.
The only automation I would use is Tailwind. It is the only 3rd party app approved by pinterest, and you can push quite a bit through it. I have heard, no proof, that people that do mass automation with other apps are getting accounts banned. The easiest way to grow is keep pinning articles. Each article you can make 3-4 pins our if it. Just change the image, description and title, but the same link. Anymore than that could cause problems.