Don't stress about the things, put the work in and follow the rule i.e 1% growth everyday will lead to 365% growth through out the year. Just focus on that 1%.
Just small things done are far more energy intensive then the big one. But I try to get the big ones done early in the day. and that makes the rest of the day easy and productive.
My favorite way to stay productive and focused throughout the day is by using the Pomodoro Technique. It involves working for 25 minutes, then taking a short break of 5 minutes. This helps me maintain concentration and avoid burnout. Give it a try and see how it boosts your productivity!