Balancing daily walks and workouts

Hi everyone! I am not TOTALLY new, but I came back to workouts after a long time away, and this is my first post here anyway. the past two years changed a lot in my routine, but one good thing is that I now manage a long walk almost every morning. I love these walks, and a day doesn't feel quite right without it. The problem is that I have no idea how to fit a workout in my day anymore. I dropped them because I felt too exhausted and had no energy for anything, then I managed to start everyday walks, but I still had no energy for workouts. I do miss them, and I think I am very much ready to start them again, but when? both walks and workouts take way too much time.