I have none. I didn't try to build a successful Instagram page.
The moment I started posting guitar content, things started picking up. I'm sure it helped that I was in an actively touring band at the time as well, so I assume fans of my music followed me and it all just kind of started snowballing at some point.
That and my passion for records and guitars were probably a good combination, a meeting of the minds, if you wanna romanticize. I also like good photography, so I put effort in my photos rather than just using my phone, which might help.
I guess my only advice would be to post about things you're passionate about. If those things are passions many people share, maybe your following will grow. Maybe it won't.
I wouldn't worry about it. IG could turn into a flop three years from now, you never know. Your passions hopefully won't, so you're better off focussing on those and letting social media run its natural course.