Flow is essential to creativity. When you are in Flow, you are entirely in what you are doing. Apart from being a productivity booster, the Flow state allows your mind to be fully invested in the task, which is an excellent setup for coming up with surprising connections and creative ideas.
The most obvious thing you should do to be in a state of Flow is to eliminate distractions as much as possible. “Distractions” in this context includes random distractions like emails, phone calls, and any other type of notification, but also “planned” context-switching. We know most working environments are built around context-switching, so this recommendation is not trivial to follow. But context-switching is both productivity and creativity killer.
Try to create islands of distraction-free work on a single task to realize the difference it can do!