Regarding approaching women, there is a universal indicator of high probability of success:
Her smile is her invitation to you.
If a woman smiles at you or gives you an extra-long look, she is inviting you to approach her and it's Game On.
In my opinion it makes no sense whatsoever to even bother with random women who don't give the "come hither" signal. This usually ends up contrived and strained. Women feel this and they reject because of it.
The way it works by nature is that the hunter hunts around, the prey shows a feminine sign of weakness or submission, and the game is on. This is nature and this will never change. I advise men to forget about approaching women who haven't shown interest. All this does is makes you feel like a failure and makes it appear to you that halfway decent women are scarce.
A man can never be universally attractive like a woman can. Men appeal to a certain subset of womankind because women respond by instinct and emotion. We men respond mostly to the physical. Therefore a woman can appeal to almost all men but a man cannot appeal to most women; only a subset. You'd be surprised how many women would have no interest whatsoever in Brad Pitt. These are the quality women who are looking for a man's substance. Why not be that man to her?
Go out on the prowl, and go after only the subset of women who send a nonverbal invitation to you. Your success rate will soar and your confidence will rise exponentially.
While implementing this strategy, be sure to clearly reject women with an air of disgust who are acting in any way that you disapprove of. Every man should get used to rejecting women. This is not to be mean, but rather to increase your confidence and normalize your view of yourself in relation to women. We need to flip the script back to what nature demands, which is men unapologetically stepping up in the world as authorities and rulers of the world.
Our weak forefathers in the 60's on down the line showed weakness and fear in the face of a handful of loudmouth feminists in the media, and college girls who were injected with feminist poison. We are here to normalize male/female dynamics. Massive numbers of early feminists have mellowed and turned their backs on feminism. This is because they develop a capacity to think and reason to some degree as they age. We men are the reasoners and the authority of the world.
Every normal woman wants a man who is dominant. Again, this is nature. Look for those little smiles and lingering looks and any other indicators of interest and forget about the neutral and negative ones. This will accomplish 75% of your work for you.