Well they are many ways to gain trust from traders, but this is a step by step means and don't happen overnight, the exchange will have to earn the trust of the traders. One of the way they can earn the trust of traders on the exchange is by having a very user friendly platform and also a great support team that are always ready to attend to the users anytime they lay a complaint, this is one reason I am so much in love with binance team because they don't joke with all what I have mentioned and it built confidence.