I use Pinterest as a source of traffic and an additional signal to Google that the site is trustworthy (if visitors come to the site through a variety of channels, not just from search, that's a significant plus to overall site promotion).
You can create a large number of accounts and boards automatically. You can also promote accounts by doing everything manually for greater effect. I prefer the second option.
If you promote only your boards, you will get few visitors to the site.
Better works when you become someone else's moderator boards, and from time to time post your pins (with links to the site promoted) mixed with regular posts, at a ratio of 1 / 20.
You need to prepare your Pinterest account beforehand, which takes 1-2 months. During that time you need to post pins on your boards, follow dozens of people, and get your own followers. Then write to the admins of the popular boards on your topic that you want to become a moderator, and then from time to time post your links. This way it is quite realistic to get 1-2k visitors per day in popular topics.
I hope this information is useful for you.