You should know about your customer's actual requirements and compare with available services in market. Is the services sufficient enough? Are customers happy with them? What is the feedback of customers.
Try to provide customers with flexible options to choose as per their requirements and try to provide maximum support from your side, this is a way to improve customer services.
The best tip here that could be given is be responsive. There is nothing worse than non-responsiveness to a customer. Moreover, always ask for feedback. Sometimes customers themselves can help you improve your customer service.
Thank You for gave your reply.