One proven productivity technique is time blocking, which involves setting an appointment (with yourself) to do a single, high-cognitive demand task or a batch of similar tasks (like emails or phone calls) in a specific time block.
Start your day time blocking with a list of no more than 3 tasks that must get done and no more than 5 tasks you should get done. Then, there are the inevitable business hygiene tasks that you have to take care of every.single.day. Email, phone calls, administrative meetings, etc.
After deciding on your must-dos (big rocks), your should dos (pebbles), and business hygiene (sand), set a focused block of time to deal with each of them. Schedule the time blocks on your calendar around your meetings and other obligations.
Be sure to match the task with your energy level while you’re time blocking so that you are handling your biggest, most taxing projects when your mental clarity and attention span are at its peak. And, schedule your routine tasks and administrative projects for time when your energy is low or you are more distraction-prone.