If you're okay with xianxia danmei (it's not conventional Western high fantasy, but there's a decent amount of worldbuilding, secondary characters, and cultivation politics/conflict), Grandmaster of Demonic Cultivation is really good. The m/m is canon.

An anon did a good job summarizing it on FFA:

https://fail-fandomanon.dreamwidth.org/330615.html?thread=1903911543#cmt1903911543