I picked the swapped Beauty and the Beast because actually a story about a cute boy who falls in love with a monster girl in a modern setting sounds kind of cool!
I know when you're starting out and struggling to build an audience things can feel really frustrating. Don't be afraid to ask for advice here on the forums about how to appeal to and stand out on Tapas, or resources for making comics and covers look more polished. Often it's less about the idea itself and more about how you present and sell it. Just keep making stuff and you'll build readers in time!