Decide on your goals. What do you want to achieve and what is not important. If you find this hard ask the question "So What?" What difference does it make if you achieve the goal, if it doesn't matter to you don't do it.
Know when to say "No." You can only do so much. You may often know that you need to say "No", but not how to say "No". If it is tricky say "No" without saying it. For example, yes I can do project X. Which project would you like to assign more resource to so that we can also deliver project Y.
In the process of deciding what to stop, or delegate we define a priority. No one can do everything it is a tradeoff on resources, budget, time and tasks.
There can be so many distractions, and different people have different ways of working. There are differences between Generation X. Y and now Z. However, by focus it does not mean turning of social media for everyone, music or TV. For some people they work more effectively in these environments. What is important is to have key points where you focus, or you bring a team together to focus, so that the project doesn't just roll along. Smooth is not necessarily good, it needs to be reviewed and challenged with new energy and input given at different intervals.
The more organisation the more time you have. This is from organising your folders, inbox, bookmarks...you name it, the better you do it the easier your life is.
Utilise technology we have so much at our finger tips. Save time on travelling and question do I really need to go? Or can this be done over Skype or Telepresence? There are times when face to face is worth the investment of time and money, so just think about the situation. Find tools that make your life easier there are so many apps and tools out there that will save you time.
Outsource things in your personal life so you can have energy at work, and have the time for the important things in your life family and friends. I feel no guilt in paying for a gardener. In fact I am doing my plants a service as most plants that touch my finger tips do not last long.