Reach tells you the total number of people who have seen your post. You can calculate it by dividing the total reach of a post by your total number of followers. For example, if you have 300 reach and 1000 followers, your reach rate is 30%.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.