I won't keep up with the growing expectations. Yeah, you become more experienced over time as long as you're putting the right kind of work in, but things move on so fast.
I don't want to get to the point where what I know or can do is irrelevant and my skillset lacks what employers need.

realistically you have a few options to stay relevant:

* apply well known, and/or well used industry standards (for example maintaining a tech, that a lot of the industry depends on)

* be the first in knowing and applying the newest technologies. (including creating them)

* know and apply a lot of different technologies (new and old)

* you can essentially circumvent the relevancy thing by just, you know.. doing your job and making whoever is your boss happy. Because then it doesn't matter if you're relevant or not. It might become problematic as soon as you get fired tho.

@thebiochemic The company I work for is pretty well established and is good at what they do, but that means they look to refine themselves rather than exploring the latest technical opportunities. Occasionally we'll have a new client come onboard with tech that my more experienced colleagues may have worked with before, or are at least better at working with than I am.

I'm not concerned about being fired at the moment, but I do know that at some point a client may come along and after x years on the job, I still might not take to the work that quickly.

Also the lack of working with the newest technologies concerns me a little for when I do decide to move on.

@DamoMac yeah that's fair enough, it's always a somewhat tricky situation. But as long as you work there and it's fine, that's okay. Should you get fired, you could take the time to explore and learn some relevant stuff then, atleast on a surface level, to then start out in a dofferent company for example.
Or just keep an eye on new stuff, while you're doing your job.