Most English Linkshells also have their own websites. Aside from some threads starting in the Figaro Section on these official forums here, fansites like ZAM, FFXIV Core etc will have similar world-specific forums and you'll find linkshell recruitment threads in them. Those threads will direct you to the shell's own website/forums/guild setup and you can apply there.

Pick one that sounds like your type. Different shells have different types of people, after all.

Figaro, which I am also on, has at least half a dozen to a dozen Linkshells actively going at any given time.