There is no single answer

When I decided to promote my Instagram account, at first it was difficult for me to find subscribers. I tried all the usual ways to increase the number of my Instagram followers: uploaded interesting photos and videos, used hashtags. But for a long time I was able to recruit only 30 subscribers. Then I decided to switch to soc-promotion, where they offered a test version of free https://soc-promotion.com/  and in a short time I managed to promote my account and gain 120 subscribers.