Exactly. I agree here. I had been using and developing on Linux for years before I got a job that was in any way related to Linux. I finally broke down and went into a hosting provider looking for work, and because of my Linux skillsets I was able to get a position working with a (at the time) new 'Cloud Platform'. My actual job there didn't involve too much Linux, day-to-day, but without my experience I could never have kept things together when it was falling apart. As I went along, the Linux skills got used more, but my job role was more about keeping the applications up and online, which just happened to involve some Linux skills here and there. I have since left there, and I actually got hired on by the developer of said 'Cloud Platform', where I worked as both the lead support engineer and then as a software developer. I got to use my LInux skills a lot more there, but still my job role was more about not just Linux but all the other pieces that went into the platform. A lot of it was proprietary and I had to learn that stuff. I also had to get into kernel development and debugging. Really, most of the day was spent just trying to help others understand how to use the product in general and trying to keep the systems online. I did, and do, end up using Linux skills a lot, but it is now entangled with so much else. Sadly, it is almost like saying you are a Windows Expert. 'Okay, well, in what area? DB, IIS, Exchange, coding, games, etc?'. Linux skills are just the starting point, unless you just want to do basic SysAdmin.
So, as for advice, I would suggest either trying to find a specific niche of IT you find interesting and start delving into it. Most likely your Linux skills will massively help you out getting things done. There are so many areas from which to choose. The other direction is going into a SysAdmin type role that has good growth potential, but that is hard to really guage.
Good luck!