Hello, Aleyandria!
Like the others have said, it depends on what you are looking for in an RP community. There isn’t much for walk-up, but personally, I haven’t had a problem finding RP of some kind happening pretty much every day of the week.
I’m fairly new to these connected realms - I started roleplaying on Cenarion Circle-Sisters of Elune in April. So far everyone has been super welcoming and helpful, and I’ve made some wonderful RP friends while here. So while you might not see much walk-up, it definitely makes up for itself in the friendliness of the community.
I second Derscha - roll up an alt and come check it out! We’ll be having our weekly Introduction to Roleplaying meet-and-greet in Orgrimmar this evening, which would be a great way to meet folks and ask any questions you might have. Details linked below!
Hope to see you around!