Discursive translates to persuasive pretty easily, I just add high modality words, maybe some personal pronouns, some more repetition and avoiding common discursive language such as 'maybe', and 'perhaps'.
I also found a really good method of (if you've only prepared discursive, or more comfortable writing in that manner), translating your discursive piece into imaginative, by delving into a character's thought process and starting with a very explicit imaginative opener, returning to that setting, but mostly writing discursive.
