This progression and these principles apply to any performer at any stage of their career. The trap we fall into when we get further down the road is we assume we're doing things that help when we're not doing things that help. Watch or save this, and see if any of these ideas help you out.
***AND*** if there's a question you wish you could type into the YouTube search re: musical theatre career and there'd be a clear answer, ask me. I'll make you a video, or I'll interview somebody who has that answer.