I hope that would help!
The reality is that the very act of drawing will cause you to improve, so you have improved; it is true.
What is also true is that you weren't ready for anatomy when you started, and you're still not ready, not even close, so in that respect you haven't improved in a way that is significant.
You simply do not draw anything well, let alone anything as complex as anatomy. For example, draw an egg, really understand it. You did a study of similar forms that had very careless lines, you may want to revisit that and do plenty of lighting studies so you have a more intuitive sense of the form in space. Draw a can, a glass, understand the cylinder form in space, see it and carefully express those ellipses so that it feels correct in space. Draw simpler forms, like milk jugs, various types of bottles and draw them carefully. Draw stacks of book, understand how they recede in space and overlap each other. Right now your drawings are generally careless. If you can draw these basic geometric objects successfully, your anatomy will automatically improve because you will generally understand how to express forms correctly. Even your drawings of cubes in perspective feels careless. If you draw anatomy as one careless form after another, they fail to connect and the drawing fails to express what you'd like. Think and draw... be precise.
Right now, even if you had a surgeon's anatomical knowledge, you cannot express it, you simply do not draw carefully, precisely and well enough.
Is that honest enough?
Stay with it.