Hi superbuyer,
Welcome to SaleHoo! :)
My advice is somewhat cheesy but I’ll say it anyway, better sell something your heart is in. It’s difficult to spend most of the hours of every day working on something you are not passionate about. Besides if it is something within your interest, you will most likely have a high level of knowledge about such product and that it will be easy for you to make innovations, competently answer customer questions and generate better ideas for promoting your list. Try to specialize and be unique. Along with you line of interests, strive to find a niche market, learn about your niche until you become an expert in it, and work at building your reputation in that market.
I'd like to share with you some posts about members who asked the same question. They also have valuable advice from the experts in our community. :)
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Hope this helps. :)