As you probably know, a fair number of people come to History.SE looking for answers regarding mythology only to find out that not only is it off-topic here, but it's not on-topic anywhere on Stack Exchange.
But there is an Area51 proposal for a mythology SE site, in the "commitment" stage, which means it needs more people to hit commit, to say that they will be active on the site beta.
Anecdotally from my own circle, I feel like there's significant overlap between history buffs and mythology nerds, so I thought people from here might be interested in making the mythology site happen.