Having an Instagram account that lacks activity would be a useless thing for you which is why knowing how to improve activity levels would be a great step that you could take. One of the best options is that of improving your instagram captions for which there are numerous websites that you could refer to for help and assistance.
Regardless of how attractive your pictures might be, if they are not accompanied by appropriate captions then the number of people that open your pictures and view them would be very little. By all means start with great pictures as people love pictures that have been created with a great deal of effort.
Once you are confident your picture has everything that it takes for people to share them, the next thing for you to work on would be your Instagram captions. You can find sample Instagram captions on various websites and you can look up these websites through search engines like Google and Yahoo.
It takes creativity to come up with decent Instagram captions and when you go through sample Instagram captions you get to broaden your own ideas and come up with even better captions then you would have otherwise thought of. Be sure your Instagram captions are relevant to and descriptive of the pictures that you share with them.