If women are fickle and flakey, men need to be providing them with the emotional highs that they crave. Aloof, bad boy behavior is a start in this. Also, as a consumable product, it's more important than ever to have a niche. The following are niches that I have identified that can lead to success. These niches will attract different women, but it will result in getting laid and/or getting extended relationships
-Be tall. Be over 6'0". Today, White women nearly demand that, especially White women who rely upon swipe apps.
-Be rich. In most US cities, the annual income requirement that women will consider you rich is $175,000+. $225,000+ in a coastal expensive big metro like New York City, Los Angeles, or San Francisco. Net worths $1-1.5 million+ can have meaning. If you're a guy who only makes $85,000 but your net worth is $2 million+ due to a family trust fund and you're under 40, that's a passable niche. It becomes more difficult to play the family money angle after age 35, but guys in their 20s/early 30s can play it if their income isn't all that amazing.
-Be fit. The most obvious way to be fit is to have big muscles. You want to have big upper body muscles. Big arms and shoulders. Big muscles aren't the only way to do it. You could have a physique like Novak Djokovic in tennis and be considered a fit guy without big muscles. A lean body type without big muscles can be competitive in the mating environment, but will be somewhat more challenging without the obviousnes of a big upper body.
I would not recommend taking steroids to get a big upper body. Steroids can affect penile function. You're better off having a Novak Djokovic style body than using steroids for the big muscles. I recommend lifting weights for all men but some men can't get huge muscles even if they lift regularly.
-Be a tattooed dirtbag possibly with a criminal record. If you're not rich, tall, or super fit, the tattooed dirtbag path is a good path. Broke, heavily tattooed guys are often the baby daddies of Walmart cashiers. This looks works with lower class women and often Hispanic/Black women. It is often Hispanic/Black guys who use the niche, but there are white trash guys in rural areas/The Rust Belt/Appalachia who pull off this look.
If you don't slot into one of those niches, then you're going to have difficulty. It's going to be more difficult to tap into women's emotions and keep her interested to prevent the flaking.