@dazzywazzy,
If you remain a graphic designer and only a graphic designer, it'll be difficult to achieve the RM5k mark.  You need to keep bettering urself and learn more about the industry.  Move from graphic designer to an Art Director and from there, a Creative Director.  The bigger the role you play in your organisation, the more valuable you are and the more valuable you are to the organisation, the higher your salary will be.

This goes for all, not just those in the designing community.  I'm quite sure big time Creative Directors like *thinks for a bit* Lee Clow, Mike Schallit, Erik Vervroegen, Tony Davidson, etc etc started from right below that ladder and made their way to where they are today.

Good Luck!