There are many ways and strategies you could use and start by completion and making great satisfaction grade that you can show to everybody in your company office or work sections, especially with your boss.
Beginning from the ground and climbed-up up to the max, use your intelligent and speaking ability with sense of personality, showing that you are the best worker office mate in the company and you must plan how to do and how to make it better, promotion is not so easy to get from your boss until he/she don’t see anything is growing or any development from you, the service and actions you make, the way you work the best and making as simple ways better than the top.
So, making sure that the job and your responsibilities is in your heart and fashion, loving your job and determination on the go, in some company there are approvals that you need to attain to do and that is to work with a lot of experience, mastering the company's objective, vision, and goals not only by words but also in a great respond.
However, we know you have already the education, any one of us have education backgrounds and you don't have to ask many times you graduated with the highest rank, meanwhile, that's not the main key to promotion or job application approvals, education is only use when the applicant where and what job is applicable to his achievement in school.
Direct to the point:
You can still submit a promotional letter, or talking to the boss with offering him/her a coffee. After that, he/she must approve your promotional request or not you still need to be humble and wait for the time he calls.