We have no plans at this time to add more levels to The Well-Trained Mind Press writing program. A student who has completed Writing With Skill, levels 1-3 is ready for a rhetoric-level program.
Susan Wise Bauer has written updated guidelines for using our writing program based on the first years of customer feedback. These guidelines include recommendations for rhetoric-level writing; you can find the guidelines here: http://downloads.peacehillpress.com/samples/pdf/WWEandWWSexplanation.pdf .
A student interested in creative writing should check out our Creative Writer series, an optional guide to sharpening skills at fiction and poetry (this doesn’t replace the Complete Writer series, but is an elective supplement): https://welltrainedmind.com/series/the-creative-writer/