Book out time
In other threads, people have said they tend to book an appointment for themselves for tasks that take an hour or longer. I have found this works well.
I would say that writing an essay needs over an hour, so next time you have that sort of an action, book time in your calendar.
The next action lists work better if they are shorter tasks that can be squeezed in and around meetings.
If you book appointments with yourself it prevents the 'meeting overload' or at least when conflicts occur you are more aware of them and tend to plan ways to deal with it better.