Ask yourself this, What makes you decide to follow an Instagram account that you don't know and are not your friends or someone you know personally?
99% people follow someone on Instagram because of their contents. They want content they like to appear in their Instagram feeds.
So, if we post interesting content, and use appropriate hashtags, the follower will eventually come up on its own.
With Virol we can easily figure out the popular content from an account or hashtag on Instagram.