WrA-A has a small neighborhood feel. Make the call for RP and people will come. The “WCP” Bearglove mentioned is the Wyrmrest Community Discord, which is 1500+ members strong and founded to help network WrA roleplayers. Link: https://discord.gg/wrawcp
WrA-H has walk-up RP in the Valley of Honor in Orgrimmar. Silvermoon is quiet at the moment but it does pop up now and again.