Every interval has a sound you can learn the way you learn a voice: the 4th of Here Comes the Bride, the 5th of Star Wars, the minor 3rd of Greensleeves. Name each by its degree and its solfège, and you hear the key, not just two notes.
Go slowly: two or three new intervals at a time, then all of them.
Try this
Sing do, then each note of the major scale up from it, naming the degree. Then let the ear game play them and name them.
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