Where should I publish my formula related to Aufbau Principle?
Have you searched the Journal of Chemical Education? There are so many articles on this topic you are interested in. If you don't have access to formal databases, start from Google Scholar and read abstracts.

Journal of Chemical Education is the right platform for such "teaching" tricks. However, you have to justify with some theory as to why your idea works. What is the logic behind it? As far as I can recall (>10 years ago), there was an article by a high-school student in that journal. So, students can also publish but you have to be quite good at that subject - similar to a professional.

However, sometimes I receive such articles for review but the tricks or analogies are so horrible that there is no option but to reject them. Similarly, make sure you know where your approach fails. Can it predict the electron configuration of all the elements? If you are a student share the idea with a chemistry teacher. See their reaction (no pun intended). Do they find it useful or have they seen it before? If yes, certainly consider writing a short note.