Intermediate to Advance in Python?

I have been coding for 5 years only python, i learned all by myself, i am able to built working stuff, But it is all hacked, really bad structure, habits, no testing, little use of classes, debugging or adding new code is a nightmare and take so long time... So i am looking for a way to being a advance level python programer, being able to work with people, how to structure BIG project, better use of classes, and just advance python in general. I don't have much interest in web development, i prefer learn numpy, opencv, that kind of library. And i would like to get some bases of ML , keras tensorflow .. Do you recommend any (paid or free) course or ressources for that ? thank you