Routine is good and change is also good, and even the temporary breaking of routine can be good.
Routine is good because it is comforting, and can also be efficient if it is a good routine. But stagnation is bad, so the routine should be changed or temporarily altered in ways that do not disturb the comfort level or efficiency. Even a bad routine can have a certain comfortableness to it.
You might want to change your routine every month or so, just because. Not entirely, just mix it up a bit.