Hello there. I would just like to share my views and opinions in this kind of matter.
First of all, I can't really tell you beforehand on whether or not Instagram is a good site for businesses because first of all that will actually depend on what kind of product you are actually selling.
For example, in Instagram we all know that such site is used to share their photos, so probably what is important there is the camera of your gadget, the number of pixels of an image, the quality of the photo, the beauty of not just the photo but also the person himself. So just by knowing all of these you can easily tell on what kind of products would really immediately sell in such kind of social media. So since this involves with gadgets like cameras and photo quality, it would be a brilliant idea to sell products that may be related to it like those detachable lenses that could be used for our smartphones, the all-time-well-known selfie sticks and many more, and since this site also includes selfies of individuals, you can sell beauty products here as well such as clothes, whitening soap, make-up, teeth whitener, and other similar products.
Now, as far as how to make your business grow bigger is concerned, you can do that by following the others answers here. Smart Advertising, Good Advertisement and such. But how can you do that?
Easy. One's you are settled on what product to sell, you should be able to relate it to something. For example, let us say you're selling a whitening soap in Instagram, so how do you advertise it?
You can advertise it by posting a photo of not only the product itself but also proof that it actually works, so here don't just upload a photo of your product, also upload a before and after photo upon using such product.
And how about buyers? How can I attract more buyers?
That's easy. You can either:
1. Be friend them online.
2. Frequently share your post for others to see, but never spam.
3. Join in any group that you could easily tell that your products can easily be noticed, and, of course, share it there for others to see as well.
4. If you have other social media accounts, share it there as well.
And lastly, always make an unforgettable quote, message, or slogan with the product that you are selling. An example of that would be those that we can easily find on television like "Ponds" which showed there that your pimples would be gone after using it frequently and after that you will no longer be hiding from the cameras.
I know that you might ask on why I am limiting the products that can be sold in Instagram. Well, you see, the main point of Instagram is to share photos to other people while Facebook is more on socialization, which means it does not only talk about photos and such but everything else as well. That's why I mentioned it earlier that I cannot tell you beforehand on whether or not your business will grow in Instagram.
That's all. I hope I was able to help. :ertery: