The Kree killed off almost all the Inhumans after the Inhumans tv show flopped and the big push in the comics flopped. The other problem was Disney bought Fox and got the X-Men/mutants rights back. So with the mutants and the Eternals I think there’s no place for the Inhumans conceptually.
So that’s why they were not at the party. What’s left of them are not relevant. If they ever make the Scarlet Witch and Quicksilver mutants and Magneto’s children I expect to see Crystal and Luna again. Most if the others will just fade away.