I try to hide my email inbox for designated chunks of time so I don’t get distracted, because sometimes I’m too eager to help my colleagues for my own good. 
(Their stuff usually ends up less urgent than I assume.)
Also, when starting a new task, I try to review what I need to know and then take a short walk, preferably outside. Sometimes, while carrying the task lightly in my mind, better approaches present themselves. There have even been rare occasions when I have realized the task didn’t need to be done at all. :zen: