Okay so if working at a prop shop is not the best way to learn trading and neither is reading books etc, what is the best and fastest way to get good at trading?
Adopt a fast feedback loop. Observe the market in it's basic granularity. Build your distinctions through deduction. Log your observations as per your trading timeframe. Debrief the day. What you first identify as 'noise' can eventually become signal.
Few ever do the work required to do this.
At some point what was once impossible becomes possible. Beliefs form perception. To increase one's perception, eventually, one will have to examine their beliefs around how markets actually function to get to the truth of the matter. Price migrates, volume leads price, etc. Many a distraction you will encounter of those whom never do the work required. Instead they complain and bray.
The fact that you are paying attention to 'things that you didn't know that can be knowable' is the right direction. That information can come through a variety of ways, even books, youtube, educators, forum posts, etc.
One can know a thing by knowing what it is not.
As you build your capacity for discernment, so to will your capacity to extract the market's full offer.