包括你自己需要继续gain/improve的skills是什么,需要等的外部条件是什么(e.g. 部门招人),who else are decision makers/influencers. Make him be very specific, incl. 还要等多久. And if I were you, I would not hesitate to tell him that, my immediate career next step is to become a manager. I think I am ready for it. Based on past conversations I am also made believe that, he thinks I am ready for it. So if it's not achievable in his group in the near term, I would appreciate him telling me.
你和他谈的时候,把他直接当成你的支持者,让他帮你出谋划策,你们是一个战壕里的,一起去争取这个目标。别把语气说成你们是对立方,你跟他提要求讨东西。