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.
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