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Use popular hashtags. Interact with other users frequently. Promote your Instagram profile on other social media accounts. Post new photos and videos between 11am-1pm and 7-9pm. Work hashtags into your bio to hook new followers.

Article:
Hashtags are one of the main ways people browse the content on Instagram. Loading your posts with well-known hashtags makes it easy for other users to find them. If they like what they see, they may decide to give you a follow.  Some of the most commonly-used hashtags on Instagram include things like #instagood, #photooftheday, #ootd (outfit of the day), and #fitspo, as well as more general tags such as #love, #travel, #friends, and #adventure. Throw out hashtags related to your personal or company brand. If you're a comedian, for example, you might use hashtags referencing terms from the comedy scene. Pay attention to what's trending. People often use hashtags to discuss pop culture and current events. Being active on other people's accounts is a virtually surefire method of gaining more followers yourself. Try liking random photos you stumble upon by clicking on popular hashtags, and leave thoughtful or encouraging comments on posts from high-profile users. Making yourself visible may cause those users' followers to take notice. Avoid leaving comments that sound selfish or desperate. Saying things like, "Follow me back!" will annoy people in a hurry. Instead, try posting something related to the picture or video you're looking at, like “Your cat is adorable. I have two calicos myself!" If you're present on other platforms, link these up with your Instagram page. You can cross-post your Instagram photos on Facebook and Twitter, for instance, or drop links to your Instagram profile in the “About Me” section of these apps with along with a request that your friends check you out there. Make some of your content Instagram-exclusive and use your other social media profiles to tease new posts—your may not see the need to follow you on Instagram if they can already see everything you post on Twitter. Lunch time and late evening are considered the “golden hours” when it comes to delivering new content to your followers. Research has shown that posts made during these times tend to accumulate the highest number of likes and shares, as this is when the majority of users are most active.  Be sure to consider your particular time zone before hitting the “Share” button. Waking, working, and sleeping hours may be slightly different, depending on where you live. Posts made during the “dead hours” outside 11am and 9pm are less likely to attract attention. One of the simplest ways to get more eyes on your bio is to incorporate a few choice hashtags. That way, your profile will show up more often when users search those particular hashtags. As with your normal posts, the more general or popular the tags, the better. Think of hashtags as a ready-made marketing device. For example, if you live in New York City and you like to cook, your bio might say something like, "Renegade sous-chef based in #NYC and specializing in #comfortfood and #fusion #cuisine."