Nine tenths of street photography is luck!
Well, 90% luck and the rest is down to chance.
The more you grow as a photographer the less of a factor luck becomes. In street photography, as in poker, luck is always a factor, but the longer you shoot the less your photography is determined by luck and the more it is formed by your vision, skill and aestetic principles.
Even more importantly, just as in poker, you need to be able to
put yourself in a position to exploit your luck. And it does not mean just be in the right place at the right time, it also means to be able to see things and also be able to translate it into top class images. If you do not know how to grab your luck by the throat and maximise the outcome, there is very little value in that luck, be it poker or street shooting.
I just write it because there is a certain tendency or misunderstanding about street photography, often seen as a genre of snapshots with no regards to aestetic or technical things unlike portraiture or landscape. I regard street photography to be as technical as these both two genres in that respect with the only difference that the street scenes do not allow you as much time as a posing model or a landscape. It does often have different aestetics compared to a portrait, but to say that all you need is to see a scene and press the button would be completely wrong and a disservice to the genre as I see it. And you will never get far with that approach. I would say it is a permanent beginner's approach. Or the word "occasional", used in your header, comes to mind.