You must write to other exchanges and pay for listing on other Top exchanges like Binance, Okex, Huobi. Own exchange is good, but you must be listed at other exchanges for increase volume and liquidity of your token.
Or just become the biggest exchange

Yes. But exchange is very new and just launched soft version. I think better to add RKT token to other popular exchanges at this time. And than they must increase own exchange. This is the first European crypto exchange?