They’re blowing it by not doing Kree/Skrull War. All the characters are in place, even including Guardians of the Galaxy - Civil War sucked imo
I don’t think they want to do an intergalactic arc until the third phase. Once they go there, there’s no place else to go. To some extent, you don’t want to too intergalactic, because it might be unrelateable to the audience.
This is what hurt Green Lantern, imo, they went too big too soon.
I think Marvel signed away use of the Skrulls along with the Fantastic Four