The hardest thing you will encounter while writing is the dynamic duo of time and planning.
Some times the best writing has to be harnessed, caught and pushed (this is the surge of creativity artists rant about. It is a real thing!), other times you must put your own energy to storm as you want!
Remember focusing requires discoline. It requires seeing one thing in front of you, and just that one thing, so your task can be completed.
How will you harness your focus today?
Turning off your phone?
Developing back story for your character?
The day is yours. The time is yours. Use both wisely.