Liyue and Inazuma hold many of my favorite soundtracks, but Enkanomiya's tunes really give them some tough competition for me. The strings and breathing in the "Combat in the Waves" track (link below) really pulled me in during some of the more intense moments.
I returned to Enkanomiya over the holiday break to tie up some loose ends (unfinished world quests, missing exploration) and was really reminded of how much I did and still enjoy it.
It's a shame that I probably won't see any new reasons to return any time soon, just like The Chasm (though less amazing, imo).
