Help I am stuck in a rut!

I’ve worked for a big media in the north east of the uk as a computer operator for the past 6 years. I’ve missed out on promotion a few times, on a low salary for the work, i.e. supporting Editorial NT systems, AP Picture desk systems and commercialfault. A varied job which I enjoy. Problem is that I seem to be going nowhere. Any advise would be great, Thanks a desperate IT Professional!