Talk about high notes

The treble is broken because there is not enough breath and strength to push it up. The bass doesn't come down, and the sound is in the wrong place. When singing, use your breath evenly. Don't highlight more than half of the breath at the beginning of a sentence, so you can't keep up with it later. The treble is powered by Dantian, the midrange is powered by the chest, and the bass is directly powered by the voice. Practice converting scales more, practice makes perfect.