How to become a team/department lead?

Hi,

How can I become a team/department lead? I guess I'm starting to feel tired of having a vision and not being able to implement it because I have 0 political power in a company.

I thought that the easiest way was to join a startup as the first person of a "department" in a company, but now I'm not sure how it's possible to get hired to a startup on the early stage.