There’s a rule in the workplace: only if you’re irreplaceable, you won’t get fired. But if you’re always irreplaceable, you’ll never get promoted…If you’re irreplaceable, it means you’re essential for a specific role due to unique skills or knowledge that others don’t have. This makes it risky for the company to promote you out of that position, as finding someone with the same capabilities might be difficult. Thus, being too essential in one role can actually limit your upward mobility.