Let something new swerve into your vision from the horizon of your focus. Let it move into the foreground. Maybe careening in and announcing itself loudly, maybe quietly joining without comment. At the same time, let something that was already happening continue to happen.
Note: If you’ve been writing longhand, you might want to take the time to transcribe what you’ve written before writing forward today. Remember that each day’s writing can grow from any attachment point in what’s already there, whether that’s sprouting out of the middle (and potentially changing the trajectory), or initiating a new center that’s not yet joined to any other.