It seems that often those students that are procrastinators, are often 'ORANGE or BLUE' personality types.
I've found sprinkling discussions and released announcements with bright colored silly gifs & photos spontaneiously engages the student just prior to the deadline, so it is sort of a 'soft fun reminder'. (ORANGE)
Also, I try to be authentic in my feedback and state that 'I am concerned' that you may have a stressful end of class if you don't turn in the following work this week " Test 2, Assignment 3, and Discussion 2. (then I share something personal or silly going on in my week about my cold coffee or dog)
I am really hoping to see you FINISH STRONG! Here is my text # if you have any questions, Ms. Lee (602)xxx-xxxx (BLUE)
Hope this jogs your thoughts for some other fun ideas for your class that will benefit your students (smile here)