I saw this tip from an Instagram marketer: In the first comment under your post, load up with as many hashtags as the system will allow. THEN three days later, delete that comment full of hashtags so you can use those again without running afoul of Instagram's algorithm.
Really this is a sign that Instagram and the use of hashtags in general are kind of broken. And if this gimmick works today, it will probably not work tomorrow.
Use social media, but work on building a better fan experience elsewhere. If Instagram is not showing your content to your followers, that is a failure by Instagram and not a reason to engage in desperate gimmicks.