Needs a new angle

I would say the opposite, stop trying to change the Predators, they are trophy hunting alien badass's who hunt for the fun of it, trying to change that and make them more complex just ruins them, they aren't trying to evolve by taking on the traits of a species they just fucking murdered.

Showing variants of that idea works, say treat it like different Predator clans hold different hunting values, where one holds quantity over quality and vice versa, or different Predators prefer a different hunt, like in humans some want a challenge others simply want to kill something because they are fucked up in the head, which could make for a fun twist in a film, a Predator arrives on earth and starts wasting people it's victim selection being all over the shop, the hero hunts down the Predator and kills it before or after it kills it's latest prey a hooker carrying a low calibre weak handgun, finding it's lair and the trophies of it's kills, but not all the victims are accounted for, and maybe the trophies aren't in quality condition, whilst at the same time we find another Predator is actually there also, which we learn this one being the one killing the higher tier victims, being possibly an older and more skilled Predator, who has now set it's sights on the hero who has proven their worth by having killed the other Predator, the hero is stalked for a while until they piece together the plot themselves just in time for the final showdown.

Predators hunt for sport, they are usually honourable in their own way, willing to fight a worthy foe man to man...kind of, it's simple and it works, the last films plot explanation for why they hunt their pray was fucking stupid as was the autistic kid being the grand prize, who fucking watches Predator films for the plot? they are fun action movies no need to overly complicate this shit imo.