I want to grow my own business on Instagram. I created a software called Instaeasy (http://instaeasyfunciona.com.br/) but I'm having some troubles finding new customers. There's a lot of competition here in Brazil and some of them have a lot of money to buy ads and find customers and I don't. What you guys would do if you were me?
The quality of the photograph and the words you tag the photograph with are keys to success on Instagram. Along with the link to your URL of course. Be selective and post only the most beautiful and interesting unique images and use the best and most relevant words for tags for the search function. Also have a consistency in the images you post. It takes time but eventually you will attract Instagram users who will follow you and share your posted images and links.
Case Studies & Social Proof of the results you are getting for people & how at the end of the day they are converting for the customer. "Followers" is a vanity metric that not many business owners care about-- they care about conversions.
Have you tried influencers? Personally, I would go for finding some small influencers that can generate content for me, that I can, after that, use for my ADs. They don't have to be big ones. Even people with 1000-5000 followers would be good. You don't even have to pay them, as a lot of them are using APPs like yours and would be more than glad to review yours.
This can be beneficial because you are, at first, generating organic reach, so you don't have to worry about the ADs competition and high expenses.
Aside from that, find a few relevant hashtags and do your best to get trending in them. If you generate an initial amount of organic followers, things will be way easier after that.