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