Most people will accept a salary that is not the highest available for the job, as long as the amount feels fair as an indication of their worth. Assess your value to the organization and present a case for a rise, based on the value you have added.
Make your case for a rise factually, assertively, and persistently.
You may feel uncomfortable asking your boss for more money. However, if you think that you are no longer receiving the appropriate pay for the job you are doing, you need to ask for a rise to show that you value yourself. You may be the type of person who focuses on doing a good job and would be happy to take a promotion based on job title rather than money – but you need to make sure you ...