There’s definitely no shortage of guilds recruiting for content.
https://us.forums.blizzard.com/en/wow/t/h-pve-ice-cream-citadel-recruiting-for-shadowlands/707685
https://us.forums.blizzard.com/en/wow/t/h-pve-whisper-is-recruiting/643840
https://us.forums.blizzard.com/en/wow/t/a-pve-battle-hardened-lfm-mythic-raid-m/731557/3
https://us.forums.blizzard.com/en/wow/t/h-pve-shadowcourt-is-recruiting/799124
Expand that to guilds that are RP guilds, and do some content on the side, and your options increase by like a lot! If you’re faction changing for the PvE/Raid Scene, you’ll probably find more interested parties Horde-side on WrA.
But I’d hold off on dong it for the RP. Enjoyable RP is about finding the RP you’re looking for, and no amount of people around can change it if you don’t enjoy the people you regularly encounter, the themes being explored, the aesthetics of the cities, etc. And that can vary highly from person to person. Not that this stuff doesn’t matter in PvE, but it’s often so much more critical in RP.
Make a Horde alt. Download the Total RP 3 app, make sure to note in your OOC/Currently section that you’re new to RP, and try hanging around the Valley of Honor/Mage Quarter to watch interactions. Or go to any of the open server events.
Feel free to walk up and comment on any odd or interesting things that might be going on. Walkup RP is basically being at a mixer. Express your interest in joining a guild/organization or explain what your character’s looking for and things should continue from there.
Here are just some server wide social events happening in the next couple days.
https://us.forums.blizzard.com/en/wow/t/h-rp-event-the-bloodhoof-story-circle/17935
https://us.forums.blizzard.com/en/wow/t/neutral-rp-event-ironforge-winter-craft-fest-192021/775098
https://us.forums.blizzard.com/en/wow/t/h-mulgore-mondays-dance-special/477363