There are lots of reasons why you might decide to apply to a job, and salary will usually be up there with the top reasons. It’s the reason why most of us work, and it’s the top motivating factor in applying for jobs in lots of cases. If you want to earn a higher salary, the obvious step to take is to hunt for a new job. It’s often easier than waiting for a promotion to arise in your current workplace.
Remember to look for other factors that matter to you as well. For example, you will have certain aspects of your work that you enjoy more than others. If you enjoy new challenges and being in a busy environment, then make sure you go to work for a big enough company that you will get this kind of atmosphere. If you enjoy managing people, check whether you will have any direct reports when you apply.