
Try reading manga by est em. While reading Momentum, all I could think was that it reminded me of est em's oneshot collections.

Sure, try:
-Show ga Hanetara Aimashou
https://www.mangaupdates.com/series.html?id=7215
-Sakuhin Number 20
https://www.mangaupdates.com/series.html?id=48964
-Ever After
https://www.mangaupdates.com/series.html?id=117026
Like Momentum, est em's BL is poetic/reflective, incorporating art (music, dance, painting) and there's a sense of melancholy. And her works have non-Japanese settings and characters. The art styles are pretty similar, too.
(Unrelated, but if you like centaurs, est em's centaur stuff is fun, too.
https://www.mangaupdates.com/series.html?id=65769
https://www.mangaupdates.com/series.html?id=65094
)

Can I add https://www.mangaupdates.com/series.html?id=20384
A bit different but gave me the same feel
See? This is why I don't want to read anything tagged tragedy. But every time...
And now I'm crying. Not just because of the ending. Everything about this work is just...