Shaysinn! How are you?
I think WrA continues to pretty much not have server lore, but several community campaigns did happen during Shadowlands, including The Year of the Scourge as Sef mentioned, its sequel Year 36, and Ascension: The Dreaming Spider. The Helping Hands campaign is ongoing now, I think, but I’m not sure if there’s a current master thread for it.
I can’t remember when the Elixir of Tongues was implemented. If it was during your hiatus, this is an in-game potion that allows you to understand /say messages spoken in the opposite faction’s main language (Common or Orcish). You’ll want both Elixirs of Tongues and the CrossRP addon (which now pairs with the Elixir and enables cross-faction /emotes and TRP profiles as well) for cross-faction RP. You can buy the elixirs from a vendor in the Legion Dalaran Underbelly; they’re usually also available on the AH.
Lastly, for getting back into the swing of things, I highly recommend joining the Wyrmrest Community Project if you haven’t done so already. They have a calendar full of Alliance, neutral, and Horde events taking place on WrA, as well as channels for finding guilds and walk-up RP, workshopping characters, and more. The Helping Hands campaign events have been on the calendar there.
Welcome back!