I told a story for one chapter. Can I use it in another chapter without telling it again?

Yes, from version 1.9.19. Every story you told in an interview is kept in the book's Codex, under Knowledge, as "Interview · your own story", with the chapters it was written into ("in Chapter 2", or "not in the book yet"). Two ways to use it again. In the Codex, press "Where else?" on the story: BookyAI reads the rest of the book and names the chapters that would gain from it, with why; "Put it there" opens that chapter with the story ready, straight to where it lands, nothing to answer again. Or open any chapter, press "Start the interview", and under "Stories you already told" press "Use it here". A chapter that already has the story is marked.