Not all employee turnover is bad. Some of it is needed. There may be people on your team who really shouldn't be on your team. (They know it and you know it.) My advice is to work hard to retain those team members whom you want your customers to remember. If you want to attract great people, then be a leader who values great people. Become known for valuing excellence and treating your best the way they deserve to be treated. Excellent companies who are known for excellent performance have excellent leaders who value their excellent employees.
Takeaway: Focusing on excellence produces more excellence.