Don’t forget to live a life.
I find the best way for me that is sustainable is to do the most important tasks first thing in the day, while the mind and body are fresh.
It can be exercise, decisions for work, read the news, look at the markets and charts.
Once completed, just cruise throughout the rest of the day.
It is impossible to be sharp and productive every minute, even if you could do it for a while it leads to burn out.