There are a lot of marketers who think that they have an amazing product, so what they do is they try to create a market for it on Instagram. It should be quite obvious why this is a non-starter. Instagram only attracts people with certain interests. Take it or leave it. Either the niche exists or it doesn't. Instead of trying tobang the drum and create demand where it doesn't exist, focus on what currently exists on Instagram and give people what they're looking for. So how do you go about finding existing niches? First, do a tag search for anything and everything related to the niche that you would like to promote. Do you see a lot of tags related to your niche? Load up those tags and see the volumes of people liking the content that used those tags. This should be able to give you a rough idea as to how many Instagram celebrities and users are interested in the subset of tags that make up your niche.