I feel the exact same way and my career path and years in the industry are pretty much the same as well. What's usually blocking me from giving other programming niches a try is that I can't imagine ever building something in them that people actually use. Everything I've studied so far has been grounded in practicality and building a compiler, for example, seemed like something that only a select few can build with good quality.

Anyway, I got the "Writing An Interpreter In Go" book and I think I'll give it a shot either way. I think I'm at a point in my career where I'm finally tired of building the same things again and again. I've also been thinking about doing a design course in Interaction Design Foundation just to get my mind interested in things again and detach myself from the work I've been doing.