Deep Work is the most valuable type of effort in a modern knowledge-driven economy. In his book of the same name, Cal Newport defines it as "activities performed in a state of distraction-free concentration that push your cognitive capabilities to their limit".
Schedule specific parts of the day for deep work and prioritise them; create an environment conducive to lengthy concentration; track how many hours you achieve.
Use games like chess or brain training apps to exercise your concentration muscles and improve their stamina.
Developing good family screen habits, such as screen-free mealtimes, evening cut-offs. Physical removal of devices to reduce temptation. Thinking about the opportunity cost of screen time: what else could you be doing?