Copilot gives me this: \b(?:ttrpg(?:s|design)?|tabletoprpg|tabletoproleplaying(?:games)?|rpglatam|rpgsea|storygames)\b (yes, I know, but my work has enterprise and it's there. I avoid it for anything critical)

That looks about where I would end up with your expression. I might have missed the (?:s|design) reduction. PS: No shame. I have copilot courtesy of work too. I don’t actually use it much, but it is handy at times.