Be aware of what other similar-sized employers are doing for their employees. Maybe you could borrow some ideas from what you hear. If nothing else, you will be more aware of the market and what attracts quality people to good jobs. There are so many possibilities out there. Remember that benefits vary depending on the size of the company and the resources available.
Communication Is Key.
It may be a bit awkward at first. Perhaps you are not sure if you want the true answer. As uncomfortable as it may seem, it will be worth the effort. An honest discussion with the unmotivated employee may provide you with a world of perspective. Maybe his or her lack of motivation has nothing to do with the job itself, but is due to personal circumstances.