Making a strict hour and a half of no-interruption a day has worked well for me. Learned this from John Cleese (feel free to ignore the word “management” in the title of the video): https://www.youtube.com/watch?v=Pb5oIIPO62g

Still occasionally get interrupted because of life, of course, but marking off an hour and a half and closing a door and putting all chores/calls on silent during that time is very helpful. And I understand that for many it is simply not possible. Private space is a luxury in much of the world.

A sense of play and no obligation also helps. For more on this I recommend Rubin’s The Creative Act.