Say it again!
Everything that needs to be said has already been said.
“Everything that needs to be said has already been said. But since no one was listening, everything must be said again.” ― André Gide
Quoted by Austin Kleon in his book Steal Like an Artist
Everything has already been said under the sun.
Everything has almost been said or done; there is nothing new that is available. We can draw inspiration from what resonates with us.
Freed from the pressure of absolute originality, we can add our unique touch to create new works. Every new idea is generally a mashup of two or more previous ideas.
If we take a very basic example of genetics - we are all a bit of both our parents — possessing features from each.
So stop worrying about being unique and start mixing it up!
Read, watch, listen, and then create.
Your voice, mixed with all the others, will be one-of-a-kind.