I think we all know that Predator queue times is easily the biggest issue, but I mean who can blame them, it is the name of the game after all, and a badass alien. However, it is clear that the longer queue times between predator and fireteam queues have created a giant skill gap between them, thus making it into the Fireteam: Hunting Grounds we know today.
My recommendations would be to add some different game modes, such as wave survival, ahem City hunter with a city map ahem, and maybe even a predator fight area where predators fight each other till one comes on top. Another interesting idea would be to add something like daily missions that require you to play a certain role to get a Varitanium reward to help spread the queue times.
If anybody has any input on that they can feel free to provide it.