I have found the best way to crank up my creativity is to keep writing. I find that, when I take a break from writing, my creativity decreases. I need the daily routine of putting my ideas on paper to keep the ideas flowing. The more I write, the more ideas I seem to have. That seems counter intuitive, but I find that it is true.
Usually, I write in the evening after my son has finished his tasks for his online school, after I have worked on my dissertation, and after my chores are done. Throughout the day, my mind will simmer as it prepares itself for the writing ahead. By the time, I sit down to write I find that the plot point I was worrying over usually works itself out or an idea will come for my blog or a journal entry.
LIke exercise, the regular routine of writing keeps my brain agile.