How to rapidly transition from task to task (and avoid getting distracted in the switchover)

When are you and I the most distracted? Often, it's right after you've finished one task and on your way to start another. You've planned your day well, but you lose your momentum and before you know it, you're in a big doom loop. How do you avoid this in between distraction so that you get tasks done and cross off all those boxes on the to-do list?