To better please your clients, ask them what they want and focus on good customer service.
Exactly what specific things you can do to better please your own clients will be different for every business. There are two parallel approaches you can take:
Firstly, ask them. No one knows what will please your clients better than your clients. Good client feedback can help you identify problems and to fix any little annoyances in your processes. This could significantly improve your clients’ satisfaction, perhaps at very little cost to you.
Secondly, focus on delivering a quality service. Service is incredibly important to clients, and if you get it right first time they’ll be happy.