Maybe focus on finishing your master first, once finished, u either:

- Stay put at ur current job, but things must change, either u should be aggresively looking for promotion or persevere there, sooner or later you will get it.

- Jump ship to private companies, the issue is whether you can talk your way through the interview, in terms of salary should not be much of pay cut. Beautify your resume, train your speaking skills and dress well for interview, good luck