the best thing is as tz3den says to get a new frame and transfer. If you cant do that or dont want to.. give it a really good clean with some wipes and get all the dirt off. Get some e6000 glue or glue specific for that type of plastic and just glue up the cracks. Those look pretty bad though, so it would probably break again, but the right glue on the right plastic can be pretty strong. This is a big part of the hobby, welcome to the other side haha
Betafpv air/meteor frame and canopy should work great and frankly be a lot better, depending on which Cetus that is I believe you need a 75mm frame size for replacement
edit: just saw the bt2.0 connector, that will have to be replaced and soldered to the fc before anything else can be tested or fixed