Been on a similar journey:
First mixing class I took. A really great primer/overview type of course that runs through the whole process from recording - mixing:
https://www.coursera.org/learn/technology-of-music-production
The next one I took that was less helpful tecnically, but a bit helpful in the theory:
https://www.coursera.org/learn/producing-music
A series of videos breaking down the whole process, with lots of technical and theory mixed in. It would be best to go through the first course I took first because this one is a little more advanced and I would be lost in some parts without having taken the basic class first.
https://www.youtube.com/playlist?list=PL60vHoJexe-GT01yAl6ddeGeY2MLoDsAJ
Great. Informative. Wild. Honestly probably the best one to watch as it’s concepts are absolutely still valid and will help you with the “why” of your process.
https://www.youtube.com/watch?v=TEjOdqZFvhY
Blogs full of info. A lot of the little "quick tips and cool tricks" mixed in with some more in depth stuff:
https://theproaudiofiles.com/
https://www.waves.com/blog
Good luck!