I'm thinking about re-starting my 10-12 mile (each way) commute. It has worked well as training in the past, so I'm looking forward to it. (Mostly.)

A few notes:

If you're riding every day, don't treat every ride as a race. You'll get tired, and pushing hard all the time is not productive.

On the other hand, try a hard ride and/or sprint intervals 1-3 times a week. Those will help you get faster and increase your stamina.

Take the long way home every week or so in the summer. New scenery = more interesting, and that interest can keep you going.

Note new or different things on your commute. Redbuds or dogwoods blooming, bluebirds fledging, the oily garlic smell of a new restaurant. You won't notice those in a car.