Ask HN: I am 30+ and bored with life and the software industry, what do I do? 11 years ago
How about switching your focus from tech to business? There is a great talk [1] by Jason Cohen, that might inspire you to find joy in looking at the craft from a different angle. Otherwise, in "Start Small Stay Small" [2] Rob Wailing addresses your exact issue in one of the first chapters - after a while you start "topping out" and moving from tech to tech feels like rehashing. That's one of the reasons he lists for making the switch from dev to entrepreneur. Maybe give it a read.
[1] https://vimeo.com/74338272
[2] http://www.amazon.de/Start-Small-Stay-Developers-Launching/d...