Years ago, after my umpteenth year of getting so many "close calls" with agents or editors, I did buy the Blueprint system. Honestly, while it might be fantastic, I just never went beyond the first few lessons in the first module. But I do things like that, a lot. Start something with so much enthusiasm, then let it slide.
But, I did eventually sign with an agent and just had a conversation accepting my fifth picture book deal! For me, and everyone will be different, I felt I benefitted more from classes/workshops, paying for critiques with editors or agents at conferences or other places where those opportunities were, writing new stuff, and reading/typing up picture books I loved. I have more than 200 books typed up. I find printing them out, seeing the spacing and pacing without illustrations attached to them, helped me "see" what successful, text only picture books looked like.
Again, the Blueprints might be fantastic, it just didn't work for me.