Maybe your mind is distracted by your sub conscious the zeigarnik effect builds up the more stuff you leave unfinished until your totally fried by it and all co

Maybe your mind is distracted by your sub conscious the zeigarnik effect builds up the more stuff you leave unfinished until your totally fried by it and all concentration is gone. List literally everything work and personal and assign its very next action (check GTD style), I find a monthly task list is way more effective than a daily one. Single out the most important 1 action you want to get done for the day and focus on that only any after that is a bonus.