possibly, instead of original the word you're thinking of is unique
Original content is easy...just knuckle down, buckle down and doit doit doit.
Unique is HARD.
As you say, almost everything thought of, has been thought of before.
As the sage says there's nothing new under the sun
Yes, the distinction between original and unique is worth pointing out. I used original because of the repeated use on this platform by others.
Anything that is a new contribution can in some way be considered "original", but to me that doesn't increase it's value as a piece of online content.
"Unique", however, I would find as a value added feature. But, alas, as you point out: "there is nothing new under the sun".
Thanks