Wikipedia has a grading scheme for articles, which can useful for figuring out how to improve your article. These are the basic quality levels.
||The article meets the good article criteria and has gone through a successful good article nomination.
||The article is mostly complete and without major issues, but requires some further work to reach good article standards.
||The article is substantial, but is still missing important content or contains a lot of irrelevant material.
||An article that is developing, but which is quite incomplete and may require further reliable sources.
||A very basic description of the topic.
You can check out the full grading scheme for more detail about these quality assessments.