Are you scheduling time daily to focus without interruption?
Set aside at least one time period during the day - no more than 90 minutes at a time (and as close to that as possible) - to focus without interruption. Time, in other words, to do something important but not urgent - to write something, reflect, strategize, imagine, work on a longer term project.
The key here is control of attention. We’re so distracted, and we’re feeding that instinct every time we move between tasks. We need to (re)train our attention. Focused attention can serve tasks - that’s the left hemisphere at work, doing rational, deductive, logical, step-by-step thinking.
The other kind of attention, which serves creativity, is where the right hemisphere is dominant. That requires deeply quieting the mind. It was Betty Edwards (Drawing on the Right Side of the Brain) who discovered that one powerful way to prompt a powerful shift from left to right hemisphere is to copy an upside down line drawing. Or simply to draw, for that matter.
But there are lots of ways to prompt the shift: take a walk in nature, go for a run, listen to classical music... Even take a shower. It’s repetition that matters. The more we train any muscle - including the right hemisphere - the stronger and more active it becomes.