The best way is to help them find out ways to complete the work faster than usual by identifying better opportunities. This would help the employee to be inquisitive about the job role and stay for long in the organization. Many employees feel that when the learning stops, they should switch jobs and this would mean leakage in the system. They should master new skills to grow in life and help the company to grow as well. The other option is to learn new skills at zero cost. These training cost a huge amount to the individuals and when the company pays for it, they happily invest time to groom on such skills.