With all due respect, what do you mean you must not rewrite the words in the sentence?
How many original versions can you make of "Freelancer.com is an amazing website" if you don't change the words in the sentence?
An amazing website, this Freelancer.com.
As a website Freelancer.com's an amazing website.
Isn't Freelancer.com an amazing website?
Amazing for a website, Freelancer.com
Or perhaps I misunderstood your instruction.