Instagram Follower help

I run an Instagram account with around 14k followers now. I get many offers for promos but rarely do them unless they fit with the content that I post. When I do sfs or something I will get like 400 followers a day easily, when I only use the comment and dm tool I will probably get like 100-150 daily. When I stop botting I will gain literally only 10 followers daily. My engagement rate is actually fairly good, I always get 10% engagement (1300+ likes) on all posts and usually have like 3 of my 9 recent posts reach 2500 likes or more. My account is private which makes people more interested in it, however, the problem I'm having is that none of my growth is organic. In my niche, I would say my content is like b+ or A- grade quality. I bought a couple of promos for like $10 each from people in my niche and I only get like 50 followers or so. What can I do to grow faster? I honestly thought that if I was this big I was bound to get some organic growth.

Hmm only thing I could think of is targeting some different hashtags you would rank high and hit explore for in your niche when you post. Other than that you're doing everything you can organically. Maybe create some stories that involve sharing or polling?