Believe it or not, the answer for this question is both really difficult to explain and also rather obvious.
The easiest way to get ideas is from other ideas. No singular idea is 100% original. There is bound to be some influence from other media in nearly everything. This is a good thing, actually. A lot of people might have written things containing similar themes to yours, but nobody has 100% your idea.
So the best course of action is to take ideas from the media you consume and then combine and modify them into something original. Say you wanted to write a piece about traveling the universe. Lots of those exist, but by combining other elements (especially those not usually found in that genre), you stray further away from the norm and in turn create something that is more original and will ultimately last with the reader for a longer amount of time. It's harder to explain to someone you got done reading "the thing about traveling space" than to explain "the thing about a giant, living colony thousands of years old traveling space" because it's a more generic concept versus a specific, unorthodox idea that can be narrowed down. And from there, combine additional elements and utilize your own creative voice to create something truly original and recognizably you.
My larger works are usually the result of months of additions and combinations, but typically have a singular source and I branch out from there. This is why the best curse of action for creating media is to consume a bit of it, something new, and see what you can take from that or alter. Don't get discouraged if something doesn't work and you drop it. I've done that dozens of times in my own works.
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