It really depends - do you want to do a technical role? Or do you want to move into management. Here's assuming you want to stay in IT.
If you want to do a technical role, I'd second a few of the suggestions here that you should download a 'nix, install some tools and learn everything there is to know about that particular technology. Bonus points for picking something that can be carted cross-platform (SQL, XML etc).
Then you can start applying for junior roles in other companies "We require a junior DBA working on MS-SQL and Oracle...". If you're good enough, you won't stay junior for long. The software is out there and it's all free - start learning it!
If you want to move into management, you generally have two career paths - managing technology or managing people. Managing technology requires you to learn about things like data centre operations, Capacity Management, Availability Management, cost accounting and charging etc etc. All these things go into making the technology side hum ie "the hardware is working properly, and we know we can pay for it now, and in the future". Companies are screaming for this type of management as they realise that the old reactive model of bodging it up to get it working now, and panic buying stuff they don't really need isn't working. They're looking for people who can formulate an IT strategy and make it work in the real world.
If you want to manage people, then start looking at leadership books, guides and education. Do you want to manage a helpdesk (didn't think so). Maybe the relevant institute of management has a short course that you could do.
I made it past the helpdesk. I started off after high school building PCs and crawling under desks with CAT-5 between my teeth. I did that for 5 years, then was a sysadmin for a web hosting company for a year, then a service desk operator for 2, then a process specialist for another year. I've been in my current role as a process manager for just over a year making 6 figures.
It can be done, but you need to differentiate yourself. Lots of guys can fix a printer - but to really add value, figure out which companies are looking to extend themselves from a reactive environment to a proactive customer focussed one, and jump on board.