Finish the prequel series cheaply in my opinion 100 million or less.
alien will pull 300 mill at the box office. I think a small group 5-6 main characters with 20 or so cannon fodder, have Watson and fasbender return, also hopefully Danny McBride (thought he was pleasantly brilliant and by far his best work) to star in the film, have the covenant get hijacked by the engineers hopefully showing the space jockey and engineers to be 2 seperate species with the engineers worshipping them??? Just make them two seperate species to make the jockeys mysterious again, than have a alien contamination set forth a series of events where we get to see another deacon like (for most people that was the best part of prometheus) David's spores + engineer = deacon. Either that or just neomorphs and xenos, and david being david. (CRAZY) LOL
Have the crew try to escape and possibly let them all die in agonizing ways (accurate and realistic to the series) and just make a solid violent ending for the prequels. Do another alien 3. I know people dont love that movie but the more horrifying and violent the final film is, the more it can make the 3 films stand the test of time.
Afterwards do an unrelated story with colonial marines and hope the curse pitchford laid on the marines doesent continue.
Rant over lol