Finding a niche is a weird, haphazard activity that sometimes happens totally non-linearly! I use a tool called Magnet2 from Helium10. It's a search volume tool that looks at common keywords searched for on Amazon. This way you can look up something like "organiser" and then it will spit out loads of niche ideas like "make up organiser" "shoe organiser" "car organiser" and it gives you how many people are searching for that thing per month! It's really amazing and has helped me launch successful products on amazon because you have the confidence that people are definitely searching and buying for that product niche before you get started. Hope that helps! Alex