After hours of frustration and thesaurus-hunting, I still couldn’t find out a way to stop getting the error in red “Description uses excessive use of the word: Book”.
I HAD to use the word “Book” as my gig is about book trailers. so i thought of replacing the alphabet “O” in the word “Book”.
I copied a text variation of the alphabet O from wikipedia page, and pasted it in place of the normal letter O.
check my gig page for example. https://www.fiverr.com/z_farrukh/make-a-stunning-book-trailer
To a reader, the word stays the same, but for fiver, they are different words. You can also do the same for other vowels and alphabets.
I hope this helps!