More information :
Instagram Followers are about foreign users with realistic profiles. These users are not real so they have no interaction with your profile nor will they be a buying public for your business.
Their usefulness has to do mainly with psychology. The prestige acquires a profile with 20,000 followers is much larger than another with 500 followers, more easily a user follows a profile that sees that many more follow it.
In combination with the interaction created by the 200 – 300 Likes that will be made in each of your new posts, give the feeling of an active and growing account with multiple benefits. On the one hand the image it will have for your profile will be more tempting for a real user to follow it, on the other hand the active profiles “suggest” Instagram itself in the searches that are made.