There are 6 key factors influencing the Instagram algorithm for the feed posts, according to Instagram:
Interest
Your Instagram feed isn’t just about who you follow, it’s also about who you like and what you like.
The higher it appears in your feed, the more the Instagram algorithm thinks you’ll “like” that post.
Relationship
The Instagram algorithm wants to give priority to showing you posts that you care about from your friends, family and accounts.
Timeliness
The algorithm not only pays attention to how much engagement your Instagram post gets, but also to how long ago the photo was posted.
Frequency
If you’re a frequent scroller, your feed will look “chronological,” as Instagram has been trying to “show you the best posts since your last visit.”
Following
If you follow a lot of people, then there are more options for Instagram to choose from, so you probably won’t see all the posts from every account.
Usage
If you’re spending a lot of time on Instagram, you’ll see more posts as Instagram digs deeper into its catalogue.
However, if you’re spending just a few minutes each day in the app, then you’ll just get the day’s highlights from the algorithms.