Anyone claiming one perfect parenting method is selling you something. Parents with multiple kids learn fast that each child is completely different, even siblings from the same parents. There's no secret formula.
There's no secret golden key to parenting. Anybody who tells you that is misleading you. Every now and then I'll meet someone who'll go, well, my kid's perfect, and everything is perfect, and everything works great. And the moment a parent says that to me, I know they only have one child. That's right, because if you've had more than one child, you know that every kid is so unique and so different, and you even can wonder sometimes, how do they both come from us? Like, they're so uniquely different.
