problem is with starting just one niche is that it may takes years to cultivate and become something. I don't have that much time and patience. So I am starting with a lot and end with a few and learning along the way

Yes all 20 sites (or more) are online, but I only work on 7 or 8 niche sites at the moment. I have to figure out what niche is going to keep me entertained. The problem is that you can spend months, years coming up with a niche and than find out that after a week of 2-3 you are not into it any longer. That is why I am starting with so many and see where my interest takes me.

Are they all published and showing up online?

I feel that setting up niches can sometimes be like buying a house or car. If you look at too many you start to become overwhelmed and they all run together. My suggestion would be to focus on just 1 niche to really give it the attention it needs and you will be an expert at that niche. You might could see if there's a broader niche that would encompass one or more of your existing niches. Cheers, Joe