Systemic health improvements leading to better behavioral output from your physiology, combined with gaining experience and being observant, should improve your "game" more than the writing of any PUA.
Beyond that, looks are likely most key, and understanding what it involves to improve looks can be worthwhile. All the way from skincare, to fillers, to implants, to bone breaking surgeries that are likely to give you permanent nerve damage. Once you understand your face, and its flaws, in a fairly complete way, you can try to improve things, and start with medically safe therapies, and if you're truly desperate, move on to medically less safe ones. Physique is likely quite useful to optimize as well, but not to the degree facial aesthetics are.
Then there's location, some places allow you to benefit from your ethnicity a lot, and may have lower standards for appearance, and/or different elements that play a big role in attraction. In the first world west, I'd say appearance is likely most important, in some other places, financial status is more key. Behavioral things also seem to differ in their impact in different locations. One thing that seems fairly steady is that a behavioral output suggesting good systemic health, high levels of motivation and high concentrations of androgenic hormones is attractive, AKA alpha male behavior, as long as it's natural and smooth.
Combine health, looks and location, and you are bound to slay, unless you're old, then only Neil Strauss can save you.
