That is the hard part. Music has been the greatest creative passion in my life. And it became my job. I currently teach guitar lessons for a living. Sometimes I enjoy it and sometimes I dread it. It pays the bills. But I also play in a couple of bands. I get paid a small amount for that when we gig, but I really do it for fun. I need it. It reminds me that I love music and playing guitar. I also write and record music. I don’t do it for money. No one buys music anymore. I do it for the joy of creativity and the hope that someone else will also enjoy it.
If writing is your job, I would suggest you find/create time to write purely for the fun of it. Don’t think about earning money. Consider these stories your after work hobby. Write something you normally wouldn’t. Something fun. Play.