You can encourage your Instagram followers to create user-generated content (UGC) by creating a suitable custom hashtag and asking them to upload any relevant photos using that hashtag. You can then regram the posts to the rest of your followers (in other words, take the photo from the user’s account and post it to your own account). Though, just make sure that the posts you decide to regram fit the style and tone of your brand. Another idea is to launch a competition using UGC.