The list of profitable niches can be endless. You just need to settle on something that you are comfortable with and easily manage without outsourcing a lot of it. At least in the first couple of months. Otherwise, some niche that I consider untapped includes: Aromatherapy, Aquaponics, Bruxism, Bread baking, Fashion for (men /women), Cellulite removal, colic relief, copywriting, Digital Detox, etc. This list can be endless!