I did my best engineering work when I was working all by myself, far out. However the calibration of the sense of where to direct my efforts went completely out

I did my best engineering work when I was working all by myself, far out. However the calibration of the sense of where to direct my efforts went completely out of whack in about 7 month. I have coded two beatific systems in the next 6 months after that, but none of my users cared enough, or even had the opportunity to appreciate it.