I agree with @noisy. If you add support for the native Steemit coins, Steem and SBD, you will generate far more interest on this platform.
After that, then including many of the other Altcoins will certainly see your platform grab attention everywhere else.
Without the above two points fulfilled, that stops me trading on your platform, even though you do offer some other very interesting services.

I'm adding you to my watch list to see how things develop.