Your developers should, imo, be working for a share of profits in the future, and not for salaries, especially with the project seems so big, and very suitable for long term profits.

I'd recommend hiring a marketing agency, or someone to take over marketing, and hand them 10,000 USD to market. I am not a professional in that region, so I can only give you some basic ideas of what I would like.

Constant content and social media updates from a professional team, Google and Twitter advertising, as well as press releases and articles. As much as you can afford, since the backend seems good, and all you need now is a good userbase (which marketing will bring in). Leave your telegram, skype or email around bitcointalk, and you'll get offers from these agencies, and make sure you pick the agency that has the experience, and is legitimate.