It’s not about tricks, fooling people and just getting high numbers of followers. You need real people, actually interested in following you and paying some attention to what you post, sell and care about.
These following tips will work well for you in any social media and site writing. Take some time to make an impression rather than looking for short cuts which don’t get you far.
Do Your Research
First, find your niche. Build your blog around a topic that you are passionate about. Next, design your blog with a theme that suits its purpose. Peruse the many themes available from Tumblr to give your blog an attractive design (see Resources). Post content on your blog on a semi-regular schedule to attract new eyes and keep your followers engaged. Finally, follow other blogs that cover topics similar to yours and follow back those who follow you.
Create a Buzz
The most successful Tumblr blogs are those that create a genuine buzz, and the most organic way to create a buzz, and gain lots of Tumblr followers a result, is simply to create a quality product. Tumblr is loosely organized around categories such as Food, Fashion, Beauty, Art, Culture and so on; check the Tumblr Spotlight page (link in Resources) to see how blogs are organized by content and review some of them to see successful blogs in action.
Tumblr is a social network more than just a bunch of blogs, and interacting with others helps you get followed. You can interact with other Tumblr users in several ways: you can “like” posts by clicking the heart icon for each post; you can reblog posts, which is a tribute to the original author and the originating post is cited in a reblog; if replies are enabled for a post, you can leave a short comment; if a blog has an Ask page, you can send the blog owner questions and comments from this page; lastly, you can message a blog you follow using Fan Mail.