Having routines can make you efficient, but unexpected thinks can also be good for you. Studies have shown that encountering unexpected situations can boost the development of the brain. They can also bring inspiration and new ideas.
But how to be both efficient and ensure you don't dull your brain? You could have part of the day controlled by routines and then throw yourself to complete chaos. Or you can have your routines allowing a small variety, have some randomness in them.
The randomness can be natural. Like in my morning routine: somebody might be up before me and already fed the cats and made the coffee. Or the shirt: it's always a surprise which one I'll pick for the day.
You can also have randomness part of the routine deliberately. Alternate the order of things you do. Take a different route. When you have a strong routine you can still pretty much run on automation even with some randomness. But it still adds a bit of a challenge for your brain. And maybe you also notice something new along the way.