Struggling to Begin

I was curious if anyone could point me in a direction for something. I’ve been doing art most of my life but it’s a lot of cartoonish type work and I really want to get more into realism and portraits. I’ve mainly been self taught with where I’m at so far but I really am at a loss with the amount of tutorials and channels and classes and everything.

I was wondering what has worked for anyone else? Is there a specific course, a YouTube video, a book, that helped you learn portraits more of? I don’t know where to start and would greatly appreciate some guidance

Thank you!