You need to understand what is your true strength and what are some areas where you need to improve on. Unless you are very good at what you’re planning to offer, it will be very hard for you to land more customers because someone rather than later will figure out the level of a quality they are getting from you, they could get from somebody paying a lot less. So if you want to become a successful freelancer, you need to get very good at what you are planning to do. And to offer a service you need to understand your skills which help you become a successful freelancer.