Many salespeople turn to their boss, supervisor, or sales manager for motivation with their sales. Motivation is a personal thing and must be addressed by each person individually. If you are a boss that is an excellent communicator but is a huge procrastinator, you and your team will suffer.
Lack of personal motivation is generally due to lack of goals. Take time to plan your week, month and year. Where do you want to be in a year or 10 years?
Take time daily to acknowledge your sales team. Rapport with your team is just as important as rapport with sales prospects. Some members of your team will need more attention than others but taking the time to bond with them and understand their high points and weaknesses will help build a better team.