My default state is distraction. What that means is that if I'm doing something, I can suddenly jump to something unrelated and not return at all. From the time I've reflected upon myself, I found that I'm easily distracted.
I've been trying to understand how best to live with this state and how to be productive in spite of this. Cal Newport's books - Deep Work and Digital Minimalism helped with ways to work with that.
The first important step that defines my day is whether I have taken the time to plan my day out. Take a day where I start my day without planning when I'll do what. I'll find myself starting with my first task and it taking most of the day if not the whole day.
The only solution that worked to avoid this is to take the time to plan the day. In the morning, sit in front of you calendar and plan all the things you want to do that day in the calendar. This step will create an intentional day. It will make it easy to resist the distractions and plough ahead. It also is the rock to which we can return to if we have wandered somewhere unrelated. This sounds simple but simple things make all the difference. Pair it with the following deep work rules to have a focused day - Don't use the internet for entertainment and use internet during a specified time.