One main thing to note with sings like this, especially the first one, is the use of quiet synths, vocals, strings or the like to create a feeling of depth, grandeur, and magic. Also notice how during the main powerful parts, multiple different instruments are playing basically the same melody but different parts of it at different octaves. This also gives depth and grandeur.
I actually saw a good video on how to effectively compose this Hollywood style orchestral type of music and I gleaned some useful things from it. It’s called how to compose cinematic music by composing academy in YouTube.
lastly, in both of these examples high quality instruments, whether virtual or real, were used. That adds a lot to depth but it doesn’t mean everything.