Better not to be in such a hurry for the listing in a new better exchange; let the team work and develop the platform well.
When there is a finished, tested, functional product, users will download it and use it, more and more. Elixir will be known and appreciated by many others and the volumes will increase; when this will happen then the exchanges themselves will look for the team for the listing, because they are interested in the volumes, which bring money

I doubt they currently have any money to get listed on better exchanges even if they wanted to, especially during the current prices. Low tier exchange like Cryptopia charges around $40k for the listing. Some guy in Telegram said that there's an opportunity to apply to get listed on Bittrex International upcoming exchange, maybe they will have smaller appetites because they need to regain their positions in the exchange market. Also there is a possibility that new exchanges won't change much and Elix will still remain as a low-volume token (at it's current state), because I did not see any big changes in the amount of token holder addresses since last year (they might attract new people with a working product, as you have said). You could read about Elix everywhere here on the forum in 2017 but it's quiet this year. In current market state bad news drop the token value (lending for example, team changes), but good news have no impact on the price. At least there's healthy volume now, not just several thousand like it was earlier. So right now Kucoin is not the worst exchange to be listed on.
As you said at the end, exchange Kucoin is already good, but as I said at this time of the market there is no need to seek with obsession a new exchange; It is wiser for the team to work and develop the product, and make it more beautiful, fast, fluid, functional, for us all.
When everything is OK, it can also be that an exchange will quote Elixir for free because it has a good product behind it.