Well I think the best shot to get the show onto a new home would probably be through Netflix or Amazon. There is a suggestions form you can fill out for this Netflix and a petition. Or you can reach out via Amazon. In the meantime, purchasing the show online via Google Play/Amazon/iTunes might help sway decisions.
https://help.netflix.com/en/titlerequest
https://www.change.org/p/netflix-net...to-the-expanse
https://twitter.com/search?q=%23Rene...panse&src=typd
https://www.reddit.com/r/TheExpanse/...ns_belters_we/
Apparently The Expanse was unanimously rated the best show on SyFy by both critics and viewers alike. SyFy just doesn't like having viewers apparently.
http://www.businessinsider.com/best-...og-season-1-20