Yeah, trying to be the first to do something is usually pretty pointless anyway because most likely, you aren't the first to the concept, just maybe the first to bring it together in that specific way. There are a lot of concepts that are just unworkable in a long-term story, or you won't feel as fond of them very long; there are others that may not be something you're really passionate enough about to make the best story it can be, so being "first" can be kind of pointless.
I don't know how many of you saw that funny (and, at times, sad) list of "100 worst adult movie titles" a while back, but one of those that stuck with me was the hilariously-titled Adventures of the Fart Bitches, which I later found out was a superhero-themed film with essentially evil women whose flatulence had the power to kill people. Which of course happened, as you might expect, after having intimate relations with them.
So someone had to come up with this concept, it had to be greenlit, funded, cast, written, rehearsed, filmed, edited, produced (with effects!) and marketed -- and there was a market for it, because it was successful enough to persist in some form until the modern day, where its title was found, amused someone compiling a list, and put on a list. I mention this because, while it's ridiculous in title and concept, it is an example of something that I can only imagine was a "first", and it makes me feel like, if it can exist and do its thing and be even a remote success, I can surely achieve some of my goals in life.
But no judgement -- as ridiculous as it is, it's something someone clearly had enough interest in and thought there was enough market for to go through with it. That's a not inconsiderable amount of work.
So I guess what I'm trying to say is, do your thing, and if it's a "first", then it's a "first", and if it's not, then it's not, but don't do something just for the sake of trying to be "first" or "original". It may not even be something you want to be attached to or remembered for, and if you don't really care about it, then you really don't want to be the person who, years later, is remembered as "the guy that did Adventures of the Fart Bitches". If that's what you want, though, go for it! It's far better to be remembered for something you love -- even if others don't understand the appeal -- than to be unable to shake the attachment of something you grew to hate.
If you have passion for even something kind of pastiche, kind of outmoded, kind of last season...bring your passion to it and bring it to life and share the reasons why you love it, through your writing. You can get people enthusiastic if you bring your love for the material and share it with them, whether or not it's a new idea. And it will always, guaranteed, be new to some of your audience, no matter how much you personally have been exposed to it. You will almost certainly be someone's first experience with something that you yourself may have seen dozens of times over your life, because you were looking for it and enjoy it already.
Just some things to think on! I hope I haven't been too incoherent. 