General Rule of Thumb for Daily Tasks
I think I found a key to do productive and relaxing activities on a daily basis:
Activities that involve action at daytime (ex: cleaning routine, self-hygiene, walking/jogging outdoors, learning activities, etc).
Relaxing activities at nighttime (ex: reading books, watching or listening soothing media, journaling or doodling, etc).
For my ADHD mind, I need to be active in the morning in order to give myself energy for the day.
And during nighttime, I need to rest my mind and body to avoid over-stimulation.