Oh man, since you are more advanced I can share some extra recs for you xD. Also since I know you like drawing people, maybe you can save this for the future. (Plz don't bankrupt yourself :P )

Figure Drawing Design and Invention by Michael Hampton this book is my literal bible. It distilles the anatomic study in a super comprehensive way, it has a lot of George Bridgeman's influence but is a lot more digestible...

Devin Korwin Creative Fundamentals vol 1 & 2. These are digital only. They are very affordable , but excluded them last time for the paid aspect; and I think it's better to dive into them with some knowledge already. He has advanced books as well but I haven't read those.

https://devinkorwin.gumroad.com/l/YPtf

https://devinkorwin.gumroad.com/l/cfv2?layout=profile

An extra

Gesture Drawing by Ryan Woodward. Series of books focusing on quick sketching technique for the human form. His approach is super sleek. This is certainly not fundamental but it's worth to check out if you are interested in that practice, just thowing it in 'cause I like it a lot.