The answer to your question would be that the word that should replace the underlined pronoun to correct the pronoun shift error is the following one: They.
A pronoun shift is a grammatical error in which an author starts a sentence, paragraph, or section of a paper using one particular type of pronoun and then suddently shifts to another. In this case, the subject of the sentence is the plural NP "writers", which refers to a third person pronoun (they). Then, the second part of the sentence contains a second person pronoun to refer back to the NP "writers" (you). That is why the pronoun shift occurs. Therefore, in order to correct this mistake, the pronoun should be replaced by "they", a third person pronoun as well.
