I'm retired now and don't know how I found enough time to ever go to work. Not sure if its because I'm interested in more things or just that it takes me longer. I'm very much a newbie at quilting so interested in trying all sorts of things but I can see that if you are going to sell what you make you might want to specialise. But there is sense in making a small variety so that you reach a wider market.
Maybe a variety of small projects that are not too time consuming so that you can perfect your skills in a relatively short time.