So, step 1, step back from the start down the "stir crazy" path that feeling stuck brings and really work out for yourself a few questions. What motivates you? What do you define as "bigger"? And what, out of that, is missing in your current role? What do you like about your current role? When did you last feel fulfilled in that role, and what specifically triggered that (money, 'official' recognition, successfully solving a complex technical issue, a genuine private thank you, a title bump implying upward progression, some overarching organizational achievement that you felt was a positive thing in the world and you felt you contributed to)? And what tech/toys/concepts/etc. have had the most positive kick on grabbing/holding your interest over the past year or so? What are you willing to trade for more money/title/etc? What do you explicitly dislike in your current role (on call, on site, providing user facing service, etc) and how much of each of those are really dislike for that facet vs just amplified frustration from the bit of stir crazy?

If it turns out it really is just the "this job plateau'd", and no other concerns, that's the easy one to fix, once you find what you want to play with in the next role out of the list of what you find job listings for, pick up a bit of the skill, and go looking for the job. If you have other priorities like family time, specific paths of tech you want to break into, ties to wherever you call home that remove the "pick up and move" option from the list of jobs you can consider, personal life problems you're ignoring in favor of work, etc., you'll want to sort those out and plan your next moves with those things too. And, back to "bigger", if you just want more responsibility, you can find that too. If you want to feel like what you do matters, who you work for suddenly matters a whole lot more, too, and you'll want to figure out what impact you want to contribute towards, and find somewhere that aligns with that.