Here's my personal pitch for an Untamed sequel miniseries, given all your fantasy world givens: an episode-of-the-week miniseries about Wen Ning and Lan Sizhui on a post-canon road trip. Featuring a slow growth of their family relationship, as Wen Ning is allowed the screen time and emotional space to process his grief for his clan and himself and his lost years and his lost family, and Lan Sizhui learns about the clan he came from while retaining and complicating his Best Lan Disciple identity, over the course of a series of episodes of saving ordinary people from monsters and ghosts and other cultivation world shenanigans. Also featuring:

- Background but unambiguously canonical Wangxian
- Song Lan, who should get to hang out with Wen Ning for a while I think
- Wen doctoring skills!!! Wen Ning may not be The Greatest Doctor Of His Generation but he still has knowledge about this!

Optionally also featuring:

- Background hints of Wei Wuxian and Jiang Cheng taking baby steps towards working their issues out (Wen Ning scowls)
- Wen Qing is alive after all (come onnnnnnn canon!!!)