In The New Yorker, Colm Tóibin on writing: "...Get an image. Follow an object. Follow the thing to see where it takes you--or follow the rhythm..." He wasn't just talking about poetry, but novels and short stories and all writing.
In Lithub, “The first line must convince me that it somehow embodies the entire unwritten text,” said William Gibson.
Advice from others might be useful, but chances are you must follow your own path. Find a place that you can write. I think it's important to respect your judgment about what makes a good poem. What is your aesthetic? What do you like in other works of poetry? If a subject presents itself to you, then write about it. Use your own voice. Listen to the work. Explore it deeply and then focus. Use your strengths.