Cool write up! I am also suffering from loss of focus with too much multitasking. Tired easily and like not completing anything well. It's really the time to put a halt and restructure my routine.
Make into mini tasks that can have intense focus. Complete and proceed to another one. However, still not that easy to maintain as there will be a lot of distraction along the way. Still in the middle of experimentation. Would love to hear more from the community :)