You're right, if you try to do it yourself, it will take a very long time. My girlfriend has own dance Studio, we opened it together. At first, we had very few people and we tried to advertise through social networks. It helped, but not as much as we wanted. Therefore, two months later, we decided that we need to ask for help in the promotion of Instagram profile. We have found suitable conditions on the website
https://socialboss.org/, began to cooperate with them and the result was not long in coming. Over the next month, the number of subscribers doubled, and customers increased by 20-25% . Further results have been smoother, but they are still there.