apart from things already mentioned here, there are lot of other things that can be done. some might be little grey but highly effective. Most people have basic approach to getting traffic. traffic is not equal to paying customer or trading user. so tell me one usp that can be marketed to gain userbase, and whole campaign can be based around it. I'd also start buying ads on CMC, getting some fake volume. redesign the UI as per 2018 standards, and relaunch exchange saying you are upgrading the platform and atleast add 1-2 new features. Do some PR. this shud help you position in the market and give good burst of targeted traffic.