Keep this in mind, users will unfollow you real quick if you’re the type that shares the same thing over and over again. Don’t let your followers get desensitized. Give them something fresh and new all the time. This is the main reason why’d they’d follow you in the first place – because they want to be kept posted of your life events.
Using selfies is not really prohibited but don’t bore your followers by posting the same one again and again. It may be your favorite, but not the others. Once or twice may be enough. You may post the same image more that twice but not more that 5 times at least. Also, if you would do that, make sure to at least edit the colors and texture so you still have something new to offer.
If you want to be continuously followed by the instagram followers, you must have a lot to offer. Do not confine yourself with just one idea. Specially if you’re not into a specific brand, make sure to take advantage of wide variety of brand available that you may use to attach your post with, depending on the current trend.