I have had a writing routine in place for the past six years. It has kept me constantly moving forward with one book after another. I wrote as soon as I got up in the morning. I sometimes had half an hour, three quarters of an hour, or more. Sometimes I only had fifteen minutes. However, the routine was there.
Then along came the summer holidays this year. We did a lot of travelling and photography for my photo book series and I gave myself a break from the daily writing habit. When the holidays were over, the routine had to be re-established.
Then my work routine changed. I was moved to shift work with one week of days followed by a week of afternoons. Starting 1½ hours earlier means there is no time to write before leaving for work. When I come home from work, sometimes the nice weather provides a diversion and the writing goes by the wayside.
When I am on afternoons, writing first thing in the morning works well. Two weeks of the month I have a workable routine for my daily writing. I am working on getting into a routine for the other week.