I've composed a very polite email and sent to Bittrex pointing out the strength of the devs, their proven successes (hardfork) and the upcoming releases.
In a non-confrontational way - let them know you are already actively trading SUMO on Crypotopia and you would love to start trading on Bittrex too (let them know there are active traders, not just campers and holders)
Hopefully they see the recent activity on Cryptopia and realize the opportunity!