@danicaswanson
Every now and then the YT algo suggests some dark ambient music that checks most or all of the boxes on my finicky list of preferences: no vocals or sudden tempo changes, meditative, at least an hour long, etc.
Even better if the art, track titles, etc. focus on monastic, esoteric, and/or architectural themes.
If you like the dark + brooding styles of ambient, give this a listen. It's repetitive enough that I don't listen to it on repeat back-to-back, but for just one hour it really hits the spot.
https://www.youtube.com/watch?v=HlP8B0KrJxk