Taking the same approach that mostly everyone else with a short imagination is taking right now, spamming and all that jazz, will of course not give you any positive result, and will make you think that this method or that method is dying, or at least will eventually and shortly die.
IM, for me, has become so much more than just yelling (metaphorically) at people's faces to buy my product or complete a damn CPA offer. To the OP, I don't know if you posted this thread to scare new people away, or just don't want to see more people spamming Instagram, but you should let instagram and their developers/support team handle spammers, you should concentrate more on taking a new approach to your business there.
You don't only have to reinvent any method posted here for it to work, I strongly believe you have to reinvent the complete way you are approaching to Internet Marketing.