There are a trillion restaurants who do burgers in Toronto, but you probably only know a dozen of them. And of that dozen, you’ve only tried a handful of them. And of that handful, even fewer you would return to.
None of these restaurants were the first ever to make a burger. It’s also likely that the reason why you went there wasn’t because they were the first (far from it), but instead they were being talked about by your friends or colleagues.
Having something worth talking about is more doable than finding an “original idea” to market.
Being hung up about not not being first is a mistake.