Do you take a Sabbath from your writing. I recommend that you take one if you can. I say, if you can, because many of you write while maintaining a real job. And you won't write much if don't write in every free moment you can muster.
After retiring from active pastoring, I began trying to write full-time. At that point God was convicting me of not having taken days off or taking enough time for spiritual and physical renewal in my 40 plus years as a pastor. So I begin my full-time writing with a Sabbath. I don't write or work on my writing from Friday evening to Saturday evening. I have found it rewarding in a number of ways.
First, I have not had to deal with burnout. Most of the time I chafe because I feel like I have not got enough done by 6:00 when I quit on Fridays. Frankly, this keeps me motivated. The break always refreshes my passion. I am usually anxious to get started again on Saturday night. Of course, we are often doing family things on Saturday and Sunday afternoons. Those things add to my motivation rather than distracting me.
I also gain inspiration in a Sabbath. I do not necessarily recommend that you stop thinking about your writing while taking a Sabbath, whenever you try to take it. But some of my best ideas come when I am not thinking about writing at all. If I didn't discipline myself a little, I would hardly ever have a time I was not thinking about my writing.
Finally, and most closely related to Biblical observance of the Sabbath, by taking a break I acknowledge that God is the source of all writing. I show that I am trusting Him to help me think. I am asking God's help in finishing what I working on. A Sabbath declares that everything I am, and have, and do comes from God. I give it to Him much like I worship with a tithe of our income.