If you supply something new with it ... like commentary, reading, or some art. Then you should be fine. You can put the poem on a photo or you can also quote yourself and give a link.' >' before the work is the code for quoting. Then just give the link. I had to do that when I was running those contests and when I didn't I was visited by cheetah too. It is a bother but it protects us too.
Major works like from Joyce or something will be seen many times on this block chain. Just don't repost a whole post like you did the first time and it is not plagiarism.
I tried what you recommended with my free ebook promo. No curator flagged it this time. Maybe it was something the curators have relaxed about since then.
Truth ... I have not seen cheetah around for a bit and so you are probably right.
Did you grab your copy of the free ebook novelette? It's a very short read, but you'll probably want the tissues handy.
I do mean to jump in there. Just drowning in things to do right now. But I have read it ... I think ... back when you were workshopping in on writerscafe.