/ic/ - Artwork/Critique

Will spending 5 months to a year doing DrawaBox classes help me improve? Anybody here did it or have any opinion on it?

Just a little context. When it comes to art I've been drawing for at least 10+ years now. I get commissions pretty frequently and have a small following but I've fallen to the trap of working only on my style and my fundamentals are trash, I rely way too much on reference even for the most basic of poses and it's even worst when I need to do backgrounds and objects.
I'm also trying to get into animating but since I lack fundamentals I have a shit ton of trouble making the most basics shapes stay on model.
Will Draw a Box help me? or do you have any other alternatives?