On the novelty in sci-fi

How to make a good sci-fi?
Hello everybody! I grew up on science fiction books of Harry Harrison, Robert Heinlein, Isaac Asimov, Philip Dick. When I was a child I watched Star Trek, Dune, Terminator, Aliens. With the development of the computer games industry, I got acquainted with such cool series as Mass Effect, Doom, Half Life, Fallout.
Our small gamedev team decided to create a sci-fi game http://steamcommunity.com/sharedfiles/filedetails/?id=910659675 , and me, as a reading person, took the role of scriptwriter. But the reading isn’t the writing. I was faced with the problem of the novelty of setting and plot. It was hard for me to think up something absolutely original, and I don’t not know is it bad or good. In other words, I came across what is called: "It was already in the Simpsons". But is it a problem?
I love George Martin's Game of Thrones, but when I read about Ancient Valiria, I always do facepalm, because for me Valiria is a miserable resemblance to Michael Moorcock’s Melniboné. Yes, the inhabitants of Melniboné aren’t blondes with purple eyes, but the most famous of them is. There is many other common features: slavery, dragons, decadence, incest, witchcraft, and the death of this civilization. And if you start to think about it more, Melniboné also reminds something ... Oh, yes, ancient Rome, probably ...
I adore Silverberg, but the sensible ocean from The Face of the Waters resembles Stanislaw Lem’s Solaris like twin. And the roots of all this, probably, are in the ancient worship of the sea. In ancient Greece, in Scandinavia, in Polynesia people pray Prayed to the ocean as a sentient being
There are many examples: terrible reptilians in the space (and of course, among us) looks like Russian Snake Gorynych, or dragons in Europe and in China, or Quetzalcoatl in America. Are the extraterrestrial civilizations with a feminine origin (both frighten and delight like Asari in Masss Effect or Yilanè from West of Eden)just the recycled legend of the Amazons? Any fantasies about tricks over time, now officially approved by modern science from the submission of Albert Einstein – are just reflection of old tales about the country of the elves or russian chud’ people, where the year goes for three?
So can we create something completely original? As it seems to me, good fantastic works should be like a bride's attire - something new, something old, something own, something another's. And then the book will simultaneously enthrall with its novelty, but some themes will fall flat on subliminal templates, strictly according to Jung, and find exactly that response in the reader's soul, which the author hopes for. Do you have to be shy and afraid of borrowing, if there is a non-illusory chance to repeat someone by accident? Or maybe it's worth adopting the rule of the magnificent Coco Chanel that costume jewelry is only good when it does not pretend to be real gold. And borrowing will not be just the stealing of other people's ideas, but a kind of Easter egg, a curtsey and a gesture of great respect to the Masters of Fiction.
In my post there are more questions than answers. I am simultaneously bewitched and frightened by the current trends in the creation of multiverse (like the Stranger against the Predator and against someone else there), the standardization of the setting (oh, again these elves or reptilians) and sometimes direct borrowing ideas from each other.
I would like to know your opinion on this matter.
(Sorry, probably bad translation)