Dive summary: 

• Pinterest is a great way to build engagement with customers; to increase your Pinterest followers list, try some of these 12 tactics. [full list at Social Media Examiner]
• In addition to adding the Pinterest follow and the profile widget to your webpage(s), try commenting on popular posts to make your name seen; Pinterest even provides a "Popular" section so you can see which posts are gaining traction. 
• Contributing to popular boards will help grab the attention of followers by showing you can add value. 

From the article: 

"It’s not just about getting followers, it’s also about keeping them happy. Make the extra effort to keep your followers satisfied so they’ll continue following you instead of leaving you."