When you didn’t have regular time to give to your writing, let your stories* just be working in your head. You can work out all kind of important elements before sitting down to write. That way, when you started to write you are already deep into your story.
*I’m using this word generically to mean all forms and genres of writing.
The Woman Writer Project 
When I do that I just obsess over one single scene over and over again until I write it
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Me to! And I’m always glad the obsessing took place in my head, so when I sit down to write, the words come.
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