Is it worth leaving? Hard to say for your specific situation, there's thousands of variables that no one here will ever know. Unless you are a superstar or independently wealthy, it's typically a bad idea to leave a job before you have something else lined up.

Is it worth looking? Absolutely! It will be much easier to make a decision when you're comparing your current position to a job offer, rather than comparing your current position to an unknown. I would also add, no matter what you feel about your current job, it's always a good idea to keep feelers out there for new positions. The fastest way up the rank and salary ladders is moving to new positions. It will always outpace internal promotions.

Assume OP is talking about grabbing a new rope before letting go of another one; otherwise we are mixing generalities about career moves not specific to the issue in the topic.