Separate some time to deep pursuits and leave the rest open to everything else. Channel your inner monastic for a limited stretch of time. Afterwards, return to regular accessibility.
Remove the obstacles of “when” and “where” by setting a time and a place for deep work, and making it a habit.
When you need to do deep work on demand:fit it into your schedule whenever you can. Developing the ability to "switch on" your deep work muscles is less challenging than dedicating the free time to purposeful work.