Yeshuos work on some people and not all people.
Because it’s not the sefer/tehilim/or the 40 trips to the kosel
It’s how it changed you. It’s how you think differently afterwards. It’s how you are growing.
That’s all Hashem wants. A “yeshuav” is only a push to get you to change/grow. If you do the yeshuah blindly and forget/don’t let it change you/don’t actually act on what you have learned than it doesn’t work.
People work. Not yeshuos.