LF underworld WvW guild
The dead server indeed only has one WvW guild that you might be interested in joining which is END. I don’t know much about them except for the fact that they’re a new guild and their guild leader seems to be an active commander.
There are also other guilds like TAL and RoT but they’re not really exclusive to WvW, and a couple of small roaming guilds like ZERK and DARE.
Good luck!