Taking a day out
Many people forget how routine their lives are. While this is especially true for those, like me, who have a regular 9-5 job, freelancers often get into their own routines, even while being less constrained by hours and location.
Doing the same thing over, day after day, contributes to creative blocks. Some might work through these blocks temporarily (by visiting sites such as this one), but it neglects the root cause of what got them into the block in the first place: routine.