The promotion follows the behaviour, not the other way round. Which means the question is not how to be seen as ready, but which things to start doing while it is still nobody's job to notice.
Managers are asked about their team. Leaders are asked about the function — where it is weak, what it should stop doing, what it will look like in eighteen months. Having an answer before anybody asks is the cheapest, most visible signal there is, and it costs a few hours of thought rather than a programme.
Managers bring status: what happened, what is late, what is fixed. Leaders bring choices: here are the two options, here is the one I recommend, here is what it costs and what I need from you. The difference is not seniority of language — it is whether the room has to do the thinking after you finish speaking.
The step is granted by other people and made by you. The gap between those two moments is usually a year, and it is entirely visible in your calendar.
Most of what will constrain you at the next level lives elsewhere — in finance's model, in the commercial team's incentives, in a technology roadmap written before you arrived. Leaders who move up have usually spent a year building relationships in those places for no immediate reason, which is exactly why it works.
Doing all of this does not guarantee promotion where you are. Some structures have no room above you, and no amount of readiness creates a seat. It does, however, make you the obvious candidate at the moment a seat appears — somewhere.
The step from managing work to leading a function is not a promotion in scale. It is a change in what you are paid to produce, and it catches good managers out.
Read → Stepping up a levelThe move from senior management into the executive team changes who you answer to, what you are trusted with, and which mistakes are survivable.
Read → Executive career coachingA board hires a story it can repeat. How to build one from twenty years of circumstance without inflating anything.
Read →A short call, your target list, and an honest answer about whether this fits how you are running your search.