I decided to start testing only these niches at first - adult models - business/luxury For adult models according to my current tests mother account is getting 1-3 followers per 1 child account per day. Adult works the best because it has high follow rate. Business most likely will have very low follow rate but quality of followers should be super good. In about a week or so I will have some screenshot of growth results I think on these accounts. Each niche will take infinite time to setup spintaxes, sources and everything. So better I keep low amount of niches at start to focus and optimize their growth. And later on add another niches.