If you like the SOTL's style of ambient (drones, with swells). Definitely check out Willamette. They have two albums that are top notch. Same two brothers are also in the ambient group Northern which is worth looking into.
https://www.youtube.com/watch?v=BIvlCLYgIT8|
Jefre Cantu-Ledesma has a lot of great ambient albums, encompassing from noise and shoegazey textures to pure drone bliss. Check out Bloodstream Sermon
https://www.youtube.com/watch?v=E86NBqyiw4g
Another great group is Rameses III and their offshoot Padang Food Tigers. Great minimalist ambient with nature field recordings and sparse folk instrumentation.
https://www.youtube.com/watch?v=ppkGOxpQJZM