Dive into your creative stream
Don’t think about the line “doubt comes in and meets a stranger”. Don’t think about Orpheus only doubting one thing in his life. Don’t think about him being confident enough to walk into hell, defy its king, and only failing when it was him who had to be good enough. Don’t think about him doubting not his love for Eurydice, but whether he is worthy of her love for him. Don’t think about him slowly starting to doubt whether the girl he walked into hell for would be able to walk out of hell for him. Don’t picture his face as he slowly realizes that he might not be enough. Don’t think about him finally turning around because he thinks that no one would follow him, because who is he to be a leader. Don’t think about his face breaking as he sees her standing there, and the love on her face as she fades away.
Don’t think about any of that :)