The point of Sifrei Yir’a is to let you know what the right attitudes are. Few Sefarim give actual tactical advice of how to be able to overcome certain things. And even then, by todays standards, it’s not helpfull enough. We need speakers that can make jokes and tell stories. Most often, the Sefarim are convincing you that you should work on these things.
They speak about Simcha and can even tell you what to happy about, but they don’t make you happy. If someone has a problem with himself and can’t control certain things, he shouldn’t open the Sefer for a remedy, he should consult someone who can help him.