One way to improve the quality of your work is to partner with other people that can collaborate with you doing a part of the work that they can do better.
For instance, as a developer you can partners with a graphic designer that is compatible with you and at the same time can do the graphic design projects that you can do the programming part.
This way you can collaborate doing the work that each of you love more and at the same time you can attend more customers with greater quality.
It is very important that you are compatible with your partners. Otherwise your business relation may end up in fights until you split and stop working together.
I have researched this topic of business compatibility between people in the last years. So I have developed a tool that gives the information of weather you are compatible with our people, so you only engage in a business relationship with other people that will engage in a business that last a long time.
For now this tool is still in a prototype phase. Later I will make it available to the general public. If you are interested in testing it, please contact me using the link at appears next to my picture in this article.