Back when I was racing in undergrad, myself and other college team members would regularly commute on bikes and also do big training rides on the weekends. We'd often remark on many other commuters who are looking like they are racing with the comment "commuter olympics!"
Slowing down in life is a good thing, when it is for the purpose of self-care. If you're a person who regularly commutes on a bike, you don't need to "put down big miles" for fitness, just get on the bike and enjoy the ride. Even if you're training to race, you still need soft-pedaling days and you still need days with no pedaling.