The law of large numbers assumes that there is an underlying probability or expectancy that does not change during the sample period for your statistical experiment ...

... The forward optimization tells me, whether my approach was simple enough to be valid....

... The breakout strategies that worked for the turtles do not work today, as new predators were born that fed on them. Trend following strategies lead to bubbles and increased volatility, attracting malicious predators not allowing them to rush to the exits and leaving behind them destruction and fear....

. Where is the niche for the individual trader? ... Sophistication does not help, but simplicity. Which are the behavioural patterns that have not changed during the sample period?

i knew you would say that...lol

Yes, but if you had written the answer in my place, I would have found something different. In this way posting here is very similar to creating algorithmic preadators that feed on other algorithms.

It stands to reason then, that the better your skills and technique, the more you should trade. While LLN is important because it "guarantees" stable long-term results for random events, it follows that it is also important that your sample of trades is large enough to maximize the number of successful outcomes from your skillful trades and therefore maximize your earning potential.

You can't find yourself subscribing to the theory that " you're only as good as your last trade. " If you are going to trade for a living, there is no last trade, only the next trade. Whether, your last trade was a winner or a loser, it has absolutely no bearing on the outcome of your next trade. Look forward to taking your next trade, because it's going to be the best trade you have ever made. At least, that's how you should be approaching it.

Unlike gambling, a winning streak by a trader will NOT eventually be overcome by the parameters of the game, unless he somehow convinces himself that this is his inevitable outcome. Trading is not gambling where the house has the edge; trading is a performance based activity that requires skill, technique, experience, and practice. Most important though, the trader must have the right attitude, focus, patience, and self-confidence, and then the trader will be the one who possesses the edge.

IMHO, on gambling, the similarities between it and trading are closer than most would think if we consider poker to be "gambling" as there are those that can win consistently both because they have great control of their emotions in addition to knowing the probabilities