I’ve got a pair tips for you: I’d even say hints, or hacks, or simply apps. About your point 6, it’s vital to interact, yes, but it’s also essential to maintain here/follower ratio on a good level. For this task i’d advocate fast unfollow. com, it allows to unfollow up to 5000 users per day. Keeping in mind that instagram’s following limit is 7.
5k it may turn out to be useful while actively building the fan base. About the 7th, it’s possible you’ll wanna use scheduling apps such postso or latergram, they have not only one aim, a few of them also have good PC interfaces which also is nice.