The phrase "each separately" can be replaced with a variety of synonyms to make writing more varied and interesting. Some options include "individually," "distinctly," "separately," "apiece," "one at a time," "singularly," "per item," "per capita," "one by one," and "by itself." Additionally, depending on the context, other phrases such as "per person," "per unit," or "per piece" could also be suitable substitutes. Utilizing these synonyms can help avoid repetition in writing and make the text more engaging for readers.