Unfortunately, Stefan isn't available to provide 1-on-1 coaching or advice on which product you should sell. Choosing a product to sell is a decision that you want to make based on a set criteria that can lead to the highest probability of success. For that reason, Stefan recommends you go through a course such as the Amazing Selling Machine and follow the criteria they provide, which has been successful for most of their students.
Otherwise, a powerful tool that we recommend to help with research is called JungleScout. JungleScout is what Stefan uses to find profitable products on Amazon a lot easier and faster. Click here to learn more about JungleScout.