The people here are worth a lot more than this company makes them believe. The logic is simple: he who doubts himself does not ask for anything better because he thinks he does not deserve better.
It took me a long time to apply for a much better job because I was convinced I certainly wouldn’t get it. And I got it. Proof that this company devalues you a lot are the many people who have found much, much better jobs. There is no reason for you to stay here.