I Have Next-to No Idea What I Am Doing

I know the videos and training is pretty clear, but I still have the ability to overcomplicate things. My mind is constantly buzzing with new ideas, and just picking a niche that's narrow enough feels insurmountable. I'm better at either filling things in (like questionaires, being given multiple choice) or creating something myself. It feels like picking a niche is in the middle of those two, and it's tripping me up. After watching the video for how to pick one, I wrote down a passion of mine, what research I already do on it, and things I purchase because of it. I did that with several topics, and now I'm at a loss.
I managed to reach the decision to do "organizing rooms," because I can lead in to decorating, crafting, and so many other things that I also love doing. I know that I won't run out of topics as fast. But as far as narrowing it down further, I can't seem to figure out how to do it. Can this topic work as is, or can it be narrowed down further?
I want to be successful with this, as I have failed in several things I've already tried. It would definitely boost my confidence in myself and my abiities, especially if I were to progress quickly. Any help I can get on this would be greatly appreciated.