Staying where you aren’t happy.
It is rare these days that loyalty and seniority are rewarded how it was depicted in popular media. These days the best way to make more money is to leave and find a new job.
Never let anyone make you work hard, work hard for you and for your goals.
In my 20s I didn’t realize how much more valuable my time was compared to the money I was being paid to give it up. The most valuable thing you have is the rest of your life, you’re being paid to give someone else your life for a time.