Welcome back, to hit the big points
I am unaware of any overarching RP discord, though there are several event, sever, coalition, nation/race, and guild servers that are up and active. Generally looking through some realm forms (particularly WrA and MG) will get you there.
I’ve never used the guild recruitment forum, but by the looks of it its primarily content focused. Your best bet, again, would be the server forums for MG and WrA. Both servers also put on guild fairs and events in game.
Most guilds tend to be generally lore abiding. Some may bend more than others, but overall stick to what we’re given and build on it from there or fill missing gaps.
I’m sure by political or IRL you’re not looking for anything too overt, and most groups have that general rule or guideline. I will say, just as a general note for all media, we are not divorced from politics and the happenings of the world. The people we play with, those who make the game and develop the world we exist in, all exist outside of the computer with their own understandings, knowledge, experience, and upbringing. Its hard to play, for example, a tauren and not have to engage with the reductionist stereotypes of North American indigenous folks used in their creation. Aint no one going to let a tauren get away with doing a “tomahawk chop.” Just a general awareness that we’ve all, more or less, moved on from potentially the last time you RP’d.
Lastly, you’ll find no shortage of guilds to join for Horde or the vertically challenged. WRA tends to be the Horde server and has a larger pool to pull from, but MG also has dedicated and great Horde side guilds to join and play with. Looking around the forums, again, would be a great start while also seeing what you want to play or main. Similarly, MG tends to be the Alliance server, but WrA also has dedicated Alliance guilds as well. Lastly lastly, with cross server tech you can join a guild on MG from ED, or vice versa, it may just be a bit more difficult to see them in the open world without a party invite.
I’d throw a list of guilds out there but too many to find and don’t want to leave anyone out. Hope it all helps and happy hunting.