Hello,
we have just released our integration into Instagram!
Make sure you update to the latest release, and you will get Instagram as an additional social media outlet, out of the box in the product.
For more details on how to post on social media, including Instagram, please see: docs.microsoft.com/.../social-posting
Regarding specific advice on how to attract an audience more effectively, it would depend on the kind of business you (industry, B2B v. B2C, etc.) are in and your particular goals (net new customers or revenue, etc.) plus other considerations as well, so it's hard to give generic advice, although you can find many resources online depending on your needs.
Hope this helps,
thanks again
M