Judging by the survey, not everyone had an increase in subscribers. I don't understand why you should try to attract subscribers or buy them. Put likes on photos or posts. Do you want more popularity? If your content is interesting, then subscribers will come by themselves. You will find your audience. But, as I understand it, it's easier to buy subscribers and not try to work on your content. My friend buys subscribers for himself https://famoid.com/buy-instagram-followers/. It also tracks its page, and he is working on his content for his subscribers.