You Will Need to do Some Homework
Grammar, Tropes, and the Oxford Comma.
(Why it's important to learn the rules.)
Writing isn't inate, it's a learned skill like anything else. You can work at it and learn and improve as long as you keep trying. And also, that's what editors are for.
Furthermore, it is the official position of ELA, insofar as much as we have an official position on anything, that you should always use the Oxford comma.