I've found that you typically have creative work that creates menial work. First, you create the plan. Then, you do the work to finish the plan. Figuring out when you are good at each helps you remove stress by avoiding feeling guilty that you aren't doing creativity well when you should be focusing on menial work and vice versa.
I have also seen that creative work motivates menial work. Too much menial work makes you feel sad and like you have lost track of why you are doing it in the first place. Doing too much creative work upfront might cause you to get stuck at 90% until you can find a way to be creative again.
Of course, when you get stuck in a negative thought spiral, all work suffers. Creative work helps you feel your way out of it in my experience.