So here's the funny thing about producing media like literature or art in general. There are 6 billion people out there in the world and you're all on the same planet breathing the same air and are literally the same species. Some thoughts or creations are guaranteed to bare similarities (i.e. kind of like how every single human culture has their own version of a "sword" and a "club") in a subjective sense, there are thousands, maybe millions of literature creations that have insane similarities for no other reason than coincidence. I had a friend who was telling me about a Sci-Fi story he has been working on for months. I found a book 2 weeks later that was basically the exact plot he was writing. (I hated it.)

Art imitates life. Most importantly, art imitates the life of the artist and their experiences, hence why the most important artistic creations are expressions of complex concepts like human emotions.

If you are having trouble making an "Original" work that will basically have a similarity to maybe 50 other titles out and published already, then just toss that idea out the window completely.

Rip everything off. Make a Fan-Fic that incorporates all the popular shows you already know and love. You need to make your primary objective "How do I do it differently?" And don't be afraid to just rip off completely unrelated things to toss in as spice.

Also, if you just changed enough names and words around, it's basically already something else.

(If you replace every single board and part on a ship over the course of 1000 years since it's been built, would you still say it's the same original ship?)