today's work setup

Anyone who really uses UML to Illustrate or understand code?
I pretty much always just get more confused when I see such a diagram.

Any tips on how to promote a niche app?
From what I have heard, an effective way is to post it on a subreddit or some specific forum (like this). But since I hate it when other people do that and the chances are high to get banned for that, I am looking for other ways.

Simple answer: I don‘t