Personal productivity is more about rhythm than perpetual motion.
Our efficiency goes in cycles during the day. Our abilities change during the day.
When are you most creative?
When are you most alert?
When can you handle numbers most easily?
When are you best for physical work?
When do you learn best?
When are you best at negotiating or meeting people?
When can you most easily catch up with a backlog of emails?
When are your energy levels highest, and when do they dip?
What can you do to change these, for example, hydration, taking a break, stretching, walking in nature?
Manage your schedule to play to the strengths within your natural rhythms.
My best wishes, Paul