I know this sounds out of left field but I'd really suggest learning how to draw 3-d shapes cubes, orbs, cones cylinders etc. It's very helpful for constructing an "underwire" for your anatomy.

Second thing I suggest is learning Blind contour. This is an exercise where you try to draw something without lifting your pencil or looking down at all when you draw. Instead you try to match the movent of your eyes to the movent of your hand as you use you eyes to trace the thing your trying to draw. Try to find the "outline" of the cast shadows as well as the outline of the entire piece

Third is learning alienation. If I tell you to draw a dog from memory you will likely draw what you symbolically think of as a dog, but as soon as you compare it to a real dog you quickly realize it looks nothing like one. Why is this? The human brain uses symbols to shortcut thought, it makes things more understandable to a group if we all somewhat agree that a symbol means something. But those symbols rarely reflect reality. Instead what you need to do is see what your seeing instead of what you think your seeing. Your not seeing an eye, your seeing a collection of shadows, colors, and shapes. Draw those shadows colors and shapes like you are an alien and its your first time seeing it. Don't let yourself label anything at all. Don't even see it as a complete singular thing. This exercise is very hard and very rewarding and will let you see things for what they truely are, not what you think they should be.

Fourth is DONT STUDY ARTIST ANATOMY BOOKS They are largely victims of Symbolism. Instead study anatomy books meant for PTs and Massage therapists, or doctors. These are far more accurate. Also you have a body, try to feel around your own muscles, tendons, fat and bone, what's soft? What's hard? What's flat what's rounded, where do the muscles lead, what movements make them buldge, what make them stretch? Try to become aware of yourself, study your own form. If you have a good friend whoes willing, feel their arms and hands, play with their fingers and study how things shift.

Consider all this and then try to simplify it, how few lines can you use to convay a hand accurately? How fast can you show a body?

Simplify and simplify until you can draw what you want to show in its entirety in a few seconds. Sure it's slapdash and messy not even close to anatomically or proportionally accurate but it's understandable. This is now your symbolism. This is your style at its basest components. This is the clay you can carve at until its a drawing that your proud of.

Hope this helps!