To increase productivity, you need to do things differently.
Learn to prioritize your work; you need to set objectives before you begin work. Use a note or a whiteboard to list out all you need to do. Do the most important things done first.
Learn to use tools that can make your life and work easier so you can work more efficiently.
Set self-imposed deadlines. This will help keep you focus and help you minimize time spent on unnecessary task.
Complete your tasks in batches. Set out time to knock out each batch.
Cancel unnecessary meetings, do away with your phone or put it on silent when working.
Eat healthy foods throughout the day and also learn to exercise regularly.
Implementing these changes will surely help you to increase your productivity.