Wikipedia has a grading scheme for articles, which can 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.