There are many reasons why a boss or head of a department won’t move you up. I could list some of the reasons, but really, you’ll never know the true answer unless your boss tells you.
The bottom line is, if you don’t have a boss willing to move you up, you have to: 1. Build up your credits, in the “next-level” position, outside of your workplace/crew
2. Create relationships with people as your “new-position” so that’s how they perceive you
My sister is in a completely different field, advertising sales. She started as an assistant in a large company that didn’t promote assistants. She had to leave her company to get a sales job for another company. After that, she was able to return to her original company as a sales person.
It happens all over, not just in the entertainment industry.
If you have a question, put it in the comment section.
To your success!