I would absolutely love to love to see a mochumentry focused on Crowley & Rowena done in the style of a "What We Do in the Shadows", but still follow a episodic series with an overarching plot. 12- 30 minute episodes a season would keep it fresh and other characters would keep the banter and plot moving.

The show could go back to a familiar season or even a different time period altogether. The show would obviously stand without the Winchester Brothers in it. The focus on the off screen dealings and adventures of Crowley. Along the way build new main demon characters, underworld financial advice, and showcase how Crowley was not just average demon, but a cunning villian/antihero. You could still meet other / familiar hunters from the eyes of Crowley and get a different perspective of them.

I know there was some bad blood there, but this could be a fresh start of a series with an already popular fantasy ready to watch.