A "learn to cook" book isn't a self help book. It's a cook book.
A "house-repairs" book isn't a self help book. It's a DIY book.
You are either misunderstanding the topic, or are being deliberately obtuse. Self help books transpose problems caused by capitalism into a problem with the individual and then tell the individual they need to change who they are and take part in hustle culture and understand that their motivational problems to grind grind grind caused by worker-alienation are actually problems with them as a human being that they need to change. Self help diverts attention away from the source of problems that capitalism is causing, aiming to treat the symptoms of these problems as a diversion away from recognising the cause.