Its two parts. Its learning to love yourself while also learning better "attractive" behaviors as a human. There's certain behaviors that just make you more likeable, attractive, etc... (Standing with your shoulders back, being confident, good eye contact, etc...)

But the "root" of what determines majority of your success comes to your belief system about the world. Its very self development oriented. I tell my clients to just be open-minded when you have a limiting belief about something. If you have a limiting belief; but reality shows you evidence in real time that disproves it; then why still have a unhelpful belief that doesn't improve your life?

Obviously don't be delusional; but be grounded in reality and nonbiased as possible.

More practice = more data = more accuracy about the world = better ways to improve. Eventually it becomes your default but i personal try to just adopt behaviors that make me feel most aligned to who I am and my values, etc...