Good way to attract players to my RP?

Hello, I recently made an RP, an odd sort of semi-nation building affair taking place in an original dark-medieval fantasy world.

At first, I was surprised with the number of responses, two people showed interest within minutes, one had a character written up not half-an-hour later! Soon after that I went to bed. Woke up and, nothing. Not one other player had showed the slightest bit of interest. I didn't think to much of this at first, because it was overnight and most North-Americans would be just getting up or at school. So I waited a few hours, came back and still nothing. I did a quick edit or two of the original post and added a few things / fixed some errors. Then I posted a thread on the "Requesting Players" thread. Hours later, and still nothing.

Am I just impatient? Does it usually take a few days for people to show interest and the players that showed interest quickly were just flukes. Is the concept unpopular? The reason I made the role-play to begin with is because most RP's around here seem very... Meh, in both creativity and quality.

Would anybody have any ideas how to increase interest?

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