Alas, this is generally not done. Please be assured, though, that a lot of people are digging through the backlog (especially since the prompt freeze let us all catch up), looking for prompts to fill, so just because your prompt is back on the last round doesn't mean it won't get filled. It's just luck of the draw, really. Some prompts generate enthusiasm, but don't spark an author to sit down at their keyboard and actually fill it. Some do. Some spark enthusiasm, things die down, and then out of the blue several weeks later someone does fill it. And because it's that unpredictable (and sometimes that delayed!), reposting prompts isn't done.

But if you have other prompts you want that you haven't yet posted, by all means do post them! And who knows? Someone might be working on your old prompt as we speak.