I've been writing related short-stories for years, but around 10 months ago, I started to think about a novel based on these stories. The same universe, the same main characters but a longer story which takes place during a longer part of their lives.
I don't want to transform one of my short-stories into a novel (like in this question) but really write a different story. My previous texts could be a kind of extension for this novel.
Anyway, I continue to write short-stories to go deeper in several points to prepare my longer story. Is this a good idea or should I stop writing short-stories in order to write my novel?