I'm of the controversial opinion — and I'll die on this hill — that the arts, western music included, have long since reached their highest possible standards.
I will argue that paintings by the likes of Michelangelo and Da Vinci, sculptures such as David or The Rape of Persephone, western classical, baroque, romantic, folk, etc. music, and so on were and remain the best examples of their respective mediums. They exemplify the mastery over their respective crafts that one ought to aspire to.
And this is obvious in the fact that these works continue to stand the test of time as being considered the all-time greats. They still have this appeal to people, hundreds of years later.
Here's the thing about reaching a high standard: The only way to truly be "original" from there is to do something that defies this standard, and the inevitable result of abandoning that paradigm is a lower standard.
In the contemporary sense regarding film music, John Williams, Goldsmith, Silvestri, Korngold, etc. are still seen as the gold standard. Their music for Star Wars, Back To The Future, whatever...they're the most popular orchestral pieces of the 20th and so far 21st centuries. Why? Because they are reminiscent of, and in many cases directly lift from the standards established in the romantic era and before.
"Batman Begins" or the scores to most of the Marvel movies, are absolutely NOT of that standard. They work for what they are, but what they are is vapid, empty pieces of music to accompany vapid, empty films. The only piece most people can recall any melody from in the entire franchise, is the "Avenger's Theme"...composed by Alan Silvestri.
These kinds of works, will — and I'll argue already have — fallen by the wayside if not be forgotten entirely in time. The MCU, much like the band KISS, will be remembered more for their record-breaking sales and furthering of unabashed consumerism of the day than any actual artistic or cultural worth.
So what to do about originality?
Concern yourself with living up the high standards of yore rather than being unique.
The obsession with being "unique" is actually a lie anyway, one which is symptomatic of society's post-enlightenment shift away from seeking to cultivate virtue and wisdom by understanding what we ought to love. It's fine to love trailer music, but you ought to love the works of Mozart or John Williams more. Otherwise, what you wind up doing is trying to convince everyone else to conform to the idea that your music of a lower standard, is actually just as good as any of the greats because you feel there is no inherent meaning in anything other than that which we choose to impart on it.
So I agree with Coleridge about the waterfall: The waterfall is, and has to be sublime — not just "pretty".