I'm a bit confused about the OP. Was your ultimate goal 3k miles / year? So you are a moth who has actually flown to the sun and survived? Now back on earth you wonder at the mundane of it all. Is that it?
I'd ask why you set the goal? If it's to see how much you can do then, set the next goal at 3,500. Or set it to do a particular purpose like ride a double century or a century if you haven't. Or try a very difficult century like the Ring of Fire we have here.
Or diversify and add mountain biking with the goal of doing some spectacular trails which demand skill and conditioning. Frex, a buddy of mine finished, with buckle, the Leadville 100 when he was 45. He thought that sort of riding was beyond him but two years ago he got serious again and made it.
The choices are limitless.