A lot of self-help is philosophical. Virtue ethics is about creating better habits that aren't vice, but that follow the golden mean, the point between deficiency and excess. Like for courage, its the balance between cowardice and recklessness. This is Aristotle, and he talks about how the ends of our actions is always aimed at a complete flourishing happiness, or ought to at least. This is in Aristotle's Nichomachean Ethics.

Also, philosophy is good at framing behavior. For instance, the reason we do evil, for Plato, is that we are ignorant of something. All vice is done out of ignorance, which I think is a very humanistic thought. I think reading plato's Protagoras is a good beginning for virtue, or his Meno too. After Virtue is also a good book that is contemporary.

There's a new thing happening in philosophy, it's called philosophical counseling. Largely its reading books with people who want to see the world differently through the eyes of the great thinkers in order to go through life wondering about the mysteries of it.It's a really interesting thought. Its like psychology but with a bigger picture.