Hey there! In EN, Staff are chosen directly from the Helper Team, where they are chosen from applicants who are applying to become one.
However, it's not always guaranteed that you'll be promoted when you become a Helper, for example, if the teams don't need anymore members at that time.
If this interests you and you'd like to try out for the Helper Team, you could read about it more
here!
Good luck if you do end up on trying out :~).
Question answered, thread closed.