The great and highly prolific sci-fi author Jeff VanderMeer (best known for his eco-apocalyptic Southern Reach trilogy) gave an interview to the Chicago Review of Books a couple years back which was just packed with fantastically clear, actionable writing tips.
One of my favorites had to do with timing and productivity, two of the great obstacles for writers who have to juggle schedules:
People sometimes misunderstand the nature of writing, in that writing and revision are ongoing processes that are intertwined and don’t necessarily happen in two distinct consecutive phases. That said, inasmuch as you do work solely on a rough draft, do that work when you are fresh and energized. This may seem like commonsense, but I’ve known many writers who never really examined their processes, just kept on with the same habits they started out with…
The point is to organize your writing days or weeks around what you know about yourself—and about diminishing returns.