Doubling down on a successful design

I have a design that's starting to sell (at least 12 times a month). I'd like to double down on it to build on the success. Is the idea that I would put the design on a different product (back of shirt, sweatshirt, etc.)? Or should I offer more variations (like the design in different colors vs Black/White)? Would those be different listings? Or add them to the existing listing?

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Doubling down on a successful design