There’s no such a thing as a unique idea. I bet someone somewhere already had or has quite a similar idea for a startup. Or even if they don’t have such an idea yet, they will have it until you launch your product.
Yeah, I know one startup does not equal another startup. But let’s say you want to build more or less a typical web business, web startup. Some SaaS business, an ecommerce store, an app or something similar.