Be a valuable employee

 Nothing increases your earning potential more than your hard work and increasing value to your employer. Wherever you work and whatever you do, unless you go up in the corporate hierarchy, your salary will not go up. With saving money alone you can only increase your savings to a limited extent. Switch jobs to maximize income, or apply for internal postings within your job to go up the ladder, as sometime an incompetent boss can ruin your career along with his/her own.