Judges ruling in intellectual property infringement cases have confirmed "stock ideas alone" have no protection. Examples; "It's a show about race car drivers", or "The show follows a worldwide scavenger hunt", or "The contestants are all blindfolded" are all ideas, but those basic ideas alone are just stock ideas. Protection of an intellectual property lives in the specific and unique expression that is created beyond a stock idea, and a buyer's solicitation and exposure to that project prior to their own development of the same. Your task as a writer/creator is to develop your "idea" into a detailed and unique expression in a fixed format (written or filmed) that proposes or proves how the idea is expressed in end result.
https://www.tvwritersvault.com/creating/how-to-protect-movie-tv-show-ideas-scripts.asp
I was reading this and while I understand the need to have an unique expression, I am not sure if being too unique is a good thing or too specific since if your idea is too specific than someone can steal your idea by making the idea more general. Am I wrong to think this and also does that mean there are specific things I should focus on my pitches such as worldbuilding instead of story? Since the story can be easily changed while the worldbuilding can be hardly changed unless we're going for something different.