The art was pretty attractive last time as well - you just need to market them better.

Know any message boards for people into Greek history and myth?

I agree with Don. You need to plan your marketing outside of the playing card community. I call this a "dual community concept." The big win will come from marketing to those who are interested in Greek mythology, history, and literature.

I don't want to say the playing card community is low hanging fruit but it has a better awareness of playing card projects. You still need to market the playing card community but increase your effort outside of the community and in the concept community (i.e., message boards, Facebook groups, partner with blogs or websites, etc.).

Why did you go with Legends branding?

Where was the promotional campaign?  You announced the launch - and vanished into thin air!  With thirty or more decks running at any given time, you need to keep people aware that your project exists or they'll forget all about it and move on to the next deck.

Looks a lot better imho

Looks good from here.  And yes, I'm agreed with Cardfool - LPCC has more precise registration allowing for more uniform centering and cutting, so you could enlarge the design a bit more and make the border a little thinner.  I think it would be an improvement.

Making the deck less expensive is always a good way to improve your odds.  Remember that a shorter print run will come with a higher per-deck cost.

The blue was much better than the black, though it needed tweaking.  If you go black, use yellow instead of metallic gold - metallic gold ink is very dark and you'll have the contrast issue all over again.

I'm still not sold on the blue, but that is MUCH better.  You'll also avoid the risk of colors not transferring from digital to print perfectly and bleeding into each other.  Apparently even more common if you design in RGB instead of CMYK, but that's just what I've heard.