Just be yourself an it will grow naturally, and the followers you gain will be there because they want to follow, I doubt many of these massive influences done there's naturally, they probably bought a ton of follows an may still do or probably buy comments, am not saying they all do it an they buy almost every follower but I do believe there's been some buying involved at some point
I done a pet one just for fun an I was spammed with these bot accounts wanting me to buy followers an comments, I wasn't interested an just followed a bunch of pet igs back (I enjoy looking at them) an it's been growing itself, it's still small, only over 100 but am not interested in what it has lol, but my point is if you follow an interact an just be natural then it will eventually grow