Hello Sir
I have been working on developing organic Instgram audience and the method you mentioned is far most the quickest and the easiest method to increase following and possible engagement. I have developed multiple accounts using this method in all of their strategies, so I'm familiar with the methodology which includes-
-Looking for hashtag suitable for our niche. (hashtag and related hashtag search)
-Engaging with similar accounts as myself to get exposure to their audience.
-Engaging with accounts which follow the hashtag related to our niche.
-Following and engaging with people who follow similar accounts.
-Liking, commenting on one or few posts of my followers on a regular basis.
-Unfollowing only after sufficient time has passed and a bond have developed.
There are a few softwares available for this very purpose which I used to easy out my work. I could recollect them once we start working.
I believe Being young, enthusiastic and experienced I believe the qualities which will make your Instagram grow exponentially. Moreover, being a great team player with good communication skills I have had no problem working for others to help them achieve the ambitions. Having knowledge of Instagram community and having worked on multiple similar projects, I find myself as the best choice for your work.
Cheers!
P.S. - Do check my portfolio.