What do you want to draw exactly?
If you're looking to draw the human figure from your head, in a realistic way, then my advice would be to study basic anatomy, as you've been doing, and just draw as many figures from life as possible. There's a youtube channel called croquis cafe that have life model videos, and they are timed 1,2,5 and 10 minute poses. Speed drawing the figure is an excellent way for your subconscious to learn the body, so you will be finding that flow and rhythm in your drawings. Also, find images of the human form and copy. These can be from real models, paintings or sculpture. I recommend studying some Rubens paintings and Michelangelo sculptures for the male form, and Titian or Correggio for the female. Also, it would be worth looking back to the Ancient Greek sculptors like Polykleitos, Pheidias and Praxiteles, because they were obsessed with proportion and symmetry in the human body.
Eventually it will become almost natural drawing the figure. But it will take a lot of repetition. Doodle as much as you can and keep the drawings. That way you can go back to them months after and see how much you've improved, (and it's also fun correcting old doodles, as if you were teaching your younger self). I've attached some doodles of Michelangelo and Leonardo Da Vinci, to show you how they rendered the body from their imagination. Most of the time they drew from sitting models.
I've been doing this for a few months now, and I'm definitely getting better.