Suppose that what I need to do is have one of the characters involved in a MMORPG and that the last time I was personally involved in a multi-player online game was on text-only MUDs back in the mid-90s.
(Specifically, I'm thinking about WoW, here, if that makes a difference.)
try to think of something else for the story
do research on the game, get some "game betas", and fake it
buy the game and play it for research
buy the game, play it for research, get completely addicted, and forget all about fandom
seek help because clearly I have a problem of one sort or another