>>107156349We will start to see them in the next phase. The first of these big entities we saw are Ego and Dormammu. They have barely dipped their toes in, and in a story where concluding the arcs of the OG Avengers is the focus, they were never going to have a bunch of cosmic literally who's show up.
Eternals:
Celestials (such as Arishem, Gammeron, and Eson)
Set
Guardians of the Galaxy 3:
Adam Warlock
High Evolutionary (tbqh him being an alien is much more credible than him being a human dude)
Doctor Strange 2:
Nightmare
Shuma Gorath (Nightmare is an ally of SG)
WandaVision:
Chthon
Loki:
Enchantress, Bor, Karnilla, etc.