I didn't know about the origins of cliche and stereotype—that's pretty cool! I've definitely been guilty of lazy poetry, especially early on in my process. I think the advice to read as much poetry as one can, from both older sources and modern ones, cannot be overemphasized. Yes, we all want to be original, but the best way to do that, counterintuitive as it may seem, is to be widely read. At least, that's been my approach to it!
One of my poetry tutors, Tim Liardet, always used to say, "The more poetry collections you read, the more you start to sound like yourself." Good advice.