You may be nailing all the recommendations mentioned earlier, and yet your Stories are still be falling flat. Now let's identify the problem. You like the content that you're making, but people don't seem to show much activity. If this is the case, the chances are you're creating great content, not for your audience but yourself. The sooner you realize this, the better. Your only goal should be getting people's attention. If your post requires any action and your viewers aren’t responsive, chances are they are not that interested. So, how to know what your target audience's interests are?
Obviously, you cannot write to each one and collect information. But luckily, there are lots of analytic tools that can show you what kind of content is the best for your followers. Instagram has some built-in statistics, but if you want to get a more thorough data analysis, you should consider using third-party applications.
Keep in mind that people following you already like your brand. So now your job is to understand who they are and what they expect to see in your feed.