Whom Allah leaves astray, no one else can guide.
Wandering blindly in one's own excess
After asking what message people will believe if not this one, Allah says whoever He sends astray has no guide, and He leaves them wandering blindly in their transgression. Ibn Kathir links it to 10:101: signs and warners do not benefit those who will not believe.
You try every self-help book, every podcast, every life coach, hoping one will finally fix you. None of them can guide a heart Allah has not opened. Ask Him first, then the books can help.
The right expert or book will set me straight.
Guidance comes only from Allah, so I turn to Him before anyone else.
Before you look for advice on your next problem, make a short dua for guidance first.