Brands prefer to promote products on social media. You can charge money for post content on our profile.
If you have huge audience, affiliate marketing might be profitable for make monet online. Add affiliate links to your bio, you can earn good amount of commission.
If you have physical product, you can sell with instagram profile. Offer products according to audience requirment like T-shirt, Health Products and more.
If you have huge fan following on instagram, you can become brand ambessador and promote their services and products in insta profile.
This is very simple work to make money with Instagram. You can offers Instagram services and knowledge to businesses who want to boost their following on insta.