Well unfortunately you won’t ever really learn how to speak the language if you don’t speak it to others.

You yourself just admitted you reached a barrier and can’t make more progress.

The next step to learn is to get over that anxiety and actually speak to someone.

Talking to people who actually speak the language is a huge help, because they will use more complex vocabulary naturally if they aren’t stupid, and the best way to learn a language is to make yourself use it.