I'm not from HR. But my experience is that companies will either match or offer a higher salary if they find your working experience relevant. You should try to look for something that is similar in nature to what you're doing now. If you manage to get a job with another Ministry, negotiate for MX11.

Your current salary might seem lower than average compared to others of your age. But I also note that you only started working at 27. So, taking that into account, I think you're earning OK. There will always be people earning more. I know of people, graduates and in their 30s, earning about your level.