My most memorable, rewarding and vivid RP experience happened to other people. And I deeply regret never having the courage to ask to get involved.
Antiquity, when I saw it circa 2009-2011, was full of pirates. But the real power was vested in New Brunswick (Duchy of ???). They had a small but regular team of roleplayers, all happy to defer to an established hierarchy. They had a Navy of 3 or 4 regular individuals who were happy to squish pirates and were augmented by 3 or 4 less regular roleplayers who would get stuck in.
Plus they had an army who were very simply, invincible. It was a pleasure to watch the entire Brunswick community work together.
The big problem was that it felt like a clique. Maybe because they were a team, there was some sort of artificial barrier to outsiders.
With hindsight, I should have just asked to get involved.
The lessons for me were never ignore other people and never be frightened of asking for help