Hello Ivan, thanks for your question. I would suggest looking at relevant tags, and the most recent posts featured there. For example, after reading your question, I did I search under #businessbooks and #startupbooks — the former is a large tag, the latter smaller.
There are already several accounts who feature just business related books. If you’re looking for more reach, look for those with 1,000 followers. Under #startupbooks I found @books.and.review, who might be an option. Joao’s account discussed above, would also be a option.
That’s what I got from just five minutes waiting for the kettle to boil this morning. Setting up your own bookstagram account dedicated to business strategy, however, would draw similarly-minded reviewers to you.
You might want to bear in mind, however, that Instagram is a decidedly young platform. You’re looking at predominantly 18-35 year olds. These readers might not yet be in a position to create departments in companies, if that’s what your book is about.