Use clear photos
And this is particularly true when you happen to be active on Stories. Don't upload pixelated or poorly composed photos. They repel audience.
Experiment with filters
Don't limit to just one filter on VSCO. Yes, that popular photography app has a paid subscription which unlocks access to premium filters unavailable on the free mode. Filters are also a creative way to express various emotions and moods to your photo upload.
Gain critical insights from analytics
Because you run a business Instagram account, you have access to Instagram Analytics which shows various data about your audience including when they're most active - best time to upload that Boomerang or announce your weekly deal.
Tag relevant accounts
This especially works when you are just starting out, and you'd like to expose your account and you're not ready to pay for a sponsored post just yet. You can tag relevant accounts who happen to interact with your business, in your posts so they get recognized. More recognition = more followers.
Include a CTA
Urge your audience to take action. It could be as simple as telling them to like your post, or maybe share them to their own IG story, or maybe visit your website. It could also be something like including a "link in bio" in your post caption which compels your audience to visit your profile. Experiment with different Instagram CTA techniques.