I definitely do!
To begin with (not biased at all here, no way!), I am one of the GMs of the Forsaken/undead-only guild Convocation of Darkness; our roleplay “niche” is Cult of Forgotten Shadows stuff, so think dark religious zealots whose primary goal is toppling the Church of the Holy Light. Not every character who joins has to necessarily fit the “religious zealot” angle (we’ve had plenty of skeptics or newer “converts” join out of a desire to help the cause), but that’s essentially the guild’s theme and informs the plot direction for our guild’s main story.
We started at the same time Dragonflight launched (a little over a year ago) and have been growing steadily ever since; we average about 1-2 RP events per week (with Discord channels for RP as well), and I’d say we’ve cultivated a small but solidly active membership core.
You can check out our forum post here! [H-RP] <Convocation of Darkness> Cult of Forgotten Shadows RP
There’s also Royal Apothecary Society if you’re looking for something a bit more mad science-y! RAS is one of the oldest guilds on Wyrmrest Accord; they’ve gone through periods of hiatus and periods of activity (I was an officer there from BFA through Shadowlands), but I believe they’re fairly active these days as well. I believe they’ve been doing a lot of RP with the MG Horde community “The Horde Vanguard” and other MG Horde guilds such as Undercity Nexus, War Wolves, etc.
Here’s their latest forum post: <H-RP> The Royal Apothecary Society
A couple of other options I know less about would be The Death Guard and Fallen of Arathor; Fallen of Arathor are a newer guild who appear to be a reformed Defilers of Arathor, so I believe they have more of an RP-PvP/PvE focus.
Fallen of Arathor forum post: Fallen of Arathor - Content/OOC Recruitment Post (RP - W - PVP - PVE)
The Death Guard don’t appear to have as much of a forum presence and I haven’t seen as many of them around lately, but a few months ago they seemed to still be going strong.
I hope this info helps! 
And welcome back!