Seriously, i'm not hating on Kongs but,
anything other than the Kongs. Perfect attempt at platformers Retro, you nailed it. Now perfect something else..
New IP preferably even. I'm not so sure a Metroid prime nowadays would fly high with it's gamecube mechanics, and finding something "new" about that franchise, while satisfying fans, would be hard as fuck to pull off, like Zelda Botw. Not many studios can even pull something like that off with a long lasting franchise.
I hope it's futuristic, i hope it's FPS, i hope it's not cartoonish (just for diversity).
In fact, bounty hunting in sci-fi, non metroid, there's a cancelled game that fit this and i think Retro would have fit in quite well.
The original Prey 2.