Ah ok, I could imagine "self-employed day-trader" or "self-employed trader" to be more catchy/on point. But this is of course your decision what you see fits better.

Yeah but still, in many places, Berlin for instance it's quite normal for people to not have a car and exception to have one. I guess the modeling part proves that you are really good at that. So far I met 10 people (including myself) who at some point planned to do (day) trading for a living. Most never left the conceptual/preparation phase, a friend of mine started, lost some money and halted it. Of them I know 2 people who did this for a longer time (years).