In addition to what the others have already said, if you’re looking specifically for night elf roleplay, the hubs at the moment are Astranaar (Ashenvale) and Bel’ameth (Amirdrassil). They might not have walk-in RP on all days, however.
This thread might help you get started, as it contains information on night elf lore, Discord communities, guilds, and events:
In particular, if your character is a priestess in-character, and you haven’t simply selected the priest class for gameplay reasons, then you might be interested in the upcoming Crescent Conclave, a gathering of the Sisterhood of Elune that is due on the 16th of March: