Encourage mastery in your team members and/or employees of your organization.
Remember, mastery is a mindset, and it is fueled by perseverance and passion for long-term goals (i.e., grit). Grit can only be achieved with intrinsic motivation, and the above steps will help you inspire such intrinsic motivation in your team members/employees.
Lastly, keep in mind that mastery is an asymptote—this means that it is something that can be approached closely but can never be fully achieved. Don’t let this discourage you from trying to achieve it, though; simply putting in the effort to achieve mastery will yield positive results.