Are you battling imposter syndrome, despite knowing the basics? You're not alone. Many programmers are in the same boat.
We're not selling you more courses. We provide human-to-human advice from the hard-won expertise of our members. We know where you are, because we've been there, and we know how to get past it.
There are enough courses and tutorials out there, lack of content isn't your problem. You need someone that understands what you know, and a path to fill in the gaps.
This isn't going to be easy, learning hard things never is. But you can rest easy that in engineer's anonymous, you're not going to get stuck again.