Instagram has been cracking down on various tactics people use to try to get ahead of the others on the platform. They’ve killed off many of the third party services that tip-toed the TOS line. Pods are pretty much a thing of the past. And they’ve implemented “shadowbanning”. A shadowban is essentially a post-specific ban that you don’t know about. Instagram kills your reach without you knowing (except for the fact that nobody engages with your stuff anymore).
An online tool was released last year which showed some promise, although it seems to have been abandoned. Individual URLs still work, but checking whole accounts never seems to have been completed. Now, though, there’s a new Instagram Shadowban Test from Triberr that checks the last 10 images you upload at once.